Sterrekunde

Is die hemel met 'n ondermaan gelyk aan 'n nuwe maan?

Is die hemel met 'n ondermaan gelyk aan 'n nuwe maan?


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Ek beplan 'n bietjie astrofotografie. En twee keer vergelyk.

Op een aand beplan ek 'n middernag-opname wanneer 'n kwynende maan om 01:00 opkom. Dit is 1 week voor die nuwemaan.

Die ander aand sou op 'n nuwe maan wees.

Sou daar van die donkerte van die hemel verwag word om anders te wees? Ek vra dit omdat baie artikels wat ek oor sterrekyk en astrofotografie gelees het, sê dat die fases van die maan belangrik is, maar noem nooit die ondergang en opgang van die maan as 'n belangrike faktor nie.


Nadat die maan ondergegaan het, is die lug donker. Daar is 'n bietjie "maanskemer", maar dit is redelik onbeduidend. Sodra die maan gesak het, hoef u u nie oor die maan te bekommer nie. Die lug sal om middernag donker wees.


Woensdag 12 Mei en die halfmaan soen Venus (na sononder)

Crescent Moon soen Venus op 12 Mei 2021 (Chris Vaughan, Starry Night Education)

Laag in die wes-noordwestelike lug na sonsondergang op Woensdag 12 Mei, sal die jong sekelmaan 'n vinger- en rsquosbreedte links onder (of 1 graad na die hemelse suide) van Venus geplaas word. Dit sal makliker wees om die baie helder planeet eers te vind, aangesien die lug na ongeveer 20 uur donkerder word. plaaslike tyd. Maak seker dat die son heeltemal ondergegaan het voordat u die verkyker of 'n teleskoop (rooi sirkel) gebruik om die duo te sien. Waarnemers in 'n groot deel van Nieu-Seeland, Oos-Polinesië en Paaseiland kan die maan okkulte Venus in die middelhemel sien.


Kom ons gaan daar uit

Kom ons speel dit uit. Van Des Moines, Iowa, waar die son Sondagoggend 07:40 uur plaaslike tyd (12:40 UT) opkom, staan ​​die korsagtige halfmaan 3 minute bo die oostelike horison en 9 ° oos van die son 30 minute voor sonop. Die ouderdom daarvan is destyds –15 uur-28 minute. Ek weet nie van u nie, maar ek het nog nooit so 'n skerf gesien nie. My persoonlike beste is 21,5 uur.

Simulasie van die oostelike hemelruim op Sondagoggend 27 Oktober vanaf Des Moines, Iowa. Rooi regmerkies toon grade azimut, met 90 ° = reg oos.
Stellarium

'N Halfuur voor sonsopkoms in Atlanta, Georgia, sal die maan 'n bietjie laer wees op 2,5 ° en die ouderdom van –16 uur-16 minute wees. Denverites sal 'n soortgelyke hoë maan op -14 uur-45 minute sien, terwyl mense in Portland, Oregon, 'n 0,5% -verligte strook van 2,4 ° hoog, 8 ° van die son en net 13 uur-25 minute van nuut af sal sien. Die teoretiese minimum skeiding van halfmaansig is 7,5 °.

Natuurlik word elke uur wat die maan verbygaan dunner, wat dit moeiliker maak om te sien. New Yorkers het 'n relatief dik 0,8% -verligte halfmaan met 'n totale grootte van –4,3. Maar teen die tyd dat die maan vir die Weskus opkom, sal dit tot 0,5% afneem en tot -3,6 vervaag. Net so sal die lengte van die sekelboog geleidelik afneem.

Uitsig vanaf Portland, Oregon, 'n halfuur voor sonop op Sondag.
Stellarium

Maak nie saak waar u is nie, vind u plaaslike sonopkoms en moenie die verkyker vergeet nie! Gebruik dit om oor die oostelike horison te vee, miskien al so 45 minute voor sonop tot binne 15 minute na die gebeurtenis. Dit is vanselfsprekend dat u 'n wye oop horison in die regte rigting benodig, oos tot suidoos. As u die boog sien, moet u dit in die oog hou terwyl u dit met 'n plaaslike baken inrig. Laat sak dan die glas en probeer om dit sonder optiese hulpmiddel te sien.

Sterkaartlysprogramme kan nie geklop word as dit gaan om te weet waar om te kyk om 'n voorwerp in die lug te sien nie. Dit is die siening op Star Map vanaf my huis op 27 Oktober om 07:00. Die skeidslyn is die horison en die onderstreepte lyn die ekliptika.
Bob King

Om te weet waar u na die maan moet soek, kan 'n groot verskil maak. Ek gebruik die gratis programme Stellarium en Carte du Ciel. Nadat u die dag en tyd ingestel het, trek u die onderste menu op en kies die liniaalpictogram. Dit sal 'n azimutrooster oor die horisonlyn vertoon: 90 ° = oos, 180 ° suid, ensovoorts. U kan ook die gratis Star Chart-app vir Android of iPhone aflaai. As u by u waarnemingswerf kom, rig die telefoon ooswaarts en sien vinnig presies waar die Maan is.

Gegewe die gunstige omstandighede van hierdie gebeurtenis, het ek 'n gevoel, as ek aanvaar dat die weer nie ons planne styg nie, dat 'n paar van ons 'n persoonlike waarnemingsrekord kan opstel terwyl ons een van die mooiste en mooiste besienswaardighede in die lug geniet.


Astronomiekalender van hemelse gebeure vir Kalenderjaar 2029

Dit sterrekunde kalender van hemelse gebeure bevat datums vir noemenswaardige hemelse gebeure, insluitend maanfases, meteorietbuie, verduisterings, opposisies, voegwoorde, en ander interessante gebeure. Die meeste astronomiese gebeure op hierdie kalender kan met die oog gesien word, hoewel sommige 'n goeie verkyker benodig om die beste te sien. Baie van die gebeure en datums wat hier verskyn, is verkrygbaar van die US Naval Observatory, The Old Farmer's Almanac., En die American Meteor Society. Gebeurtenisse op die kalender word volgens datum georganiseer en elkeen word geïdentifiseer met 'n sterrekunde-ikoon soos hieronder uiteengesit. Let daarop dat alle datums en tye in die Gecoördineerde Universele Tyd (UTC) omgeskakel moet word na u plaaslike datum en tyd. U kan die onderstaande UTC-widget gebruik om uit te vind hoeveel uur u plaaslike tyd moet optel of aftrek.

3, 4 Januarie - Quadrantids Meteor Shower. Die kwadrantiede is 'n bogemiddelde stort, met tot 40 meteore per uur op sy hoogtepunt. Dit word vermoedelik geproduseer deur stofkorrels wat agtergelaat is deur 'n uitgestorwe komeet bekend as 2003 EH1, wat in 2003 ontdek is. Die stort duur jaarliks ​​van 1-5 Januarie. Dit bereik hierdie jaar 'n hoogtepunt in die nag van die 3de en die oggend van die 4de. Ongelukkig sal die kwynende maan hierdie jaar baie flouer meteore uit die weg ruim. Maar as u geduldig is, kan u dalk nog 'n paar helderder vang. Die beste besigtiging sal na middernag vanaf 'n donker plek wees. Meteore straal uit die sterrebeeld Bootes, maar kan oral in die lug verskyn.

14 Januarie - Nuwemaan. Die maan sal aan dieselfde kant van die aarde as die son geleë wees en sal nie in die naghemel sigbaar wees nie. Hierdie fase vind plaas om 17:26 UTC. Dit is die beste tyd van die maand om flou voorwerpe soos sterrestelsels en sterretrosse waar te neem, omdat daar geen maanlig is om in te meng nie.

14 Januarie - Gedeeltelike sonsverduistering. 'N Gedeeltelike sonsverduistering vind plaas wanneer die maan slegs 'n gedeelte van die son bedek, soms soos 'n hap wat uit 'n koekie geneem is. 'N Gedeeltelike sonsverduistering kan slegs veilig waargeneem word met 'n spesiale sonfilter of deur na die son se weerkaatsing te kyk. Hierdie gedeeltelike verduistering sal regdeur Noord-Amerika en Suid-Amerika sigbaar wees. Dit kan die beste gesien word vanaf Kanada met 'n dekking van 87%.
(NASA-kaart- en verduisteringsinligting)

30 Januarie - Volmaan. Die maan sal aan die oorkant van die aarde geleë wees, aangesien die son en sy gesig heeltemal sal verlig. Hierdie fase vind om 06:04 UTC plaas. Hierdie volmaan het deur vroeë Indiaanse stamme bekend gestaan ​​as die Wolf Moon omdat dit die tyd van die jaar was toe honger wolfspakke buite hul kampe gehuil het. Hierdie maan is ook bekend as die Ou Maan en die Maan na Yule.

9 Februarie - Mercurius tydens die grootste westelike verlenging. Die planeet Mercurius bereik die grootste westelike verlenging van 25,7 grade vanaf die son. Dit is die beste tyd om Mercurius te besigtig, aangesien dit op die hoogste punt bo die horison in die oggendhemel sal wees. Soek die planeet laag in die oostelike lug net voor sonop.

13 Februarie - Nuwemaan. Die maan sal aan dieselfde kant van die aarde as die son geleë wees en sal nie in die naghemel sigbaar wees nie. Hierdie fase vind om 10:33 UTC plaas. Dit is die beste tyd van die maand om flou voorwerpe soos sterrestelsels en sterretrosse waar te neem, omdat daar geen maanlig is om in te meng nie.

28 Februarie - Volmaan, Supermaan. Die maan sal aan die oorkant van die aarde geleë wees, aangesien die son en sy gesig heeltemal sal verlig. Hierdie fase vind om 17:11 UTC plaas. Hierdie volmaan het deur vroeë Indiaanse stamme as die sneeumaan bekend gestaan ​​omdat die swaarste sneeu gewoonlik gedurende hierdie tyd van die jaar geval het. Aangesien jag moeilik is, staan ​​hierdie maan ook deur sommige stamme bekend as die Hunger Moon, aangesien die harde weer die jag moeilik gemaak het. Dit is ook die eerste van drie supermoons vir 2029. Die Maan sal naby sy naaste aarde wees en lyk effens groter en helderder as gewoonlik.

15 Maart - Nuwemaan. Die maan sal aan dieselfde kant van die aarde as die son geleë wees en sal nie in die naghemel sigbaar wees nie. Hierdie fase vind om 04:21 UTC plaas. Dit is die beste tyd van die maand om flou voorwerpe soos sterrestelsels en sterretrosse waar te neem, omdat daar geen maanlig is om in te meng nie.

20 Maart - Maart-ewening. Die ewening van Maart vind om 08:06 UTC plaas. Die son sal direk op die ewenaar skyn en daar sal bykans gelyke hoeveelhede dag en nag regoor die wêreld wees. Dit is ook die eerste lentedag in die Noordelike Halfrond en die eerste herfsdag in die Suidelike Halfrond.

25 Maart - Mars by Opposisie. Die rooi planeet sal die naaste aarde bereik en sy gesig sal volledig deur die son verlig word. Dit sal helderder wees as enige ander tyd van die jaar en sal die hele nag sigbaar wees. Dit is die beste tyd om Mars te besigtig en te fotografeer. Met 'n mediumgrootte teleskoop kan u die donker besonderhede op die oranje oppervlak van die planeet sien.

20 Februarie - Volmaan, Supermaan. Die maan sal aan die oorkant van die aarde geleë wees, aangesien die son en sy gesig heeltemal sal verlig. Hierdie fase vind plaas om 23:24 UTC. Hierdie volmaan het deur vroeë Indiaanse stamme as die sneeumaan bekend gestaan ​​omdat die swaarste sneeu gewoonlik gedurende hierdie tyd van die jaar geval het. Aangesien jag moeilik is, staan ​​hierdie maan ook deur sommige stamme bekend as die Hunger Moon, aangesien die harde weer die jag moeilik gemaak het. Dit is ook die laaste van twee supermoons vir 2027. Die maan sal naby sy naaste benadering van die aarde wees en lyk effens groter en helderder as gewoonlik.

30 Maart - Volmaan, Supermoon. Die maan sal aan die oorkant van die aarde geleë wees, aangesien die son en sy gesig heeltemal sal verlig. Hierdie fase vind om 02:27 UTC plaas. Hierdie volmaan was deur vroeë Indiaanse stamme bekend as die Volwurmmaan, want dit was die tyd van die jaar wanneer die grond sou versag en die erdwurms weer sou verskyn. Hierdie maan het ook bekend gestaan ​​as die volle kraaimaan, die volle korstmaan, die volle sapmaan en die vaste maan. Dit is ook die tweede van drie supermoons vir 2029. Die maan sal die naaste aan die aarde wees en lyk effens groter en helderder as gewoonlik.

11 April - Jupiter by Opposisie. Die reuse-planeet sal die naaste aan die aarde wees en sy gesig sal volledig deur die son verlig word. Dit sal helderder wees as enige ander tyd van die jaar en sal die hele nag sigbaar wees. Dit is die beste tyd om Jupiter en sy mane te besigtig en te fotografeer. 'N Mediumgrootte teleskoop sou u van die besonderhede in Jupiter se wolkbande kon wys. Met 'n goeie verkyker kan u die vier grootste mane van Jupiter sien, wat aan beide kante van die planeet as helder kolletjies verskyn.

13 April - Nuwemaan. Die maan sal aan dieselfde kant van die aarde as die son geleë wees en sal nie in die naghemel sigbaar wees nie. Hierdie fase vind plaas om 21:42 UTC. Dit is die beste tyd van die maand om flou voorwerpe soos sterrestelsels en sterretrosse waar te neem, omdat daar geen maanlig is om in te meng nie.

13 April - Apophis se naaste benadering. Die asteroïde Apophis sal sy naaste benadering tot die aarde maak. Apophis, wat in 2004 ontdek is, het 'n deursnee van ongeveer 1.066 voet (325 meter). Die reusagtige ruimterots sal so 31 300 kilometer na die aarde se oppervlak beweeg. Dit sal dit binne die wentelbane van geosinchrone kommunikasiesatelliete bring. Dit kan 'n sterkte van 3,4 bereik, sodat dit met die blote oog sigbaar word vanaf 'n donker lughemel. Aangesien daar geen maan sal wees nie, kan dit 'n skouspelagtige gebeurtenis wees. Alhoewel dit 'n uiters noue ontmoeting sal wees, is die kans dat die asteroïde die aarde tref, net 'n miljoen kans.

21 April - Mercurius tydens die grootste oostelike verlenging. Die planeet Mercurius bereik die grootste oostelike verlenging van 20,1 grade vanaf die son. Dit is die beste tyd om Mercurius te besigtig aangesien dit op die hoogste punt bo die horison in die aandhemel sal wees. Kyk na die planeet laag in die westelike lug net na sononder.

22, 23 April - Lyrids Meteor Shower. Die Lyrids is 'n gemiddelde stort, en lewer gewoonlik ongeveer 20 meteore per uur op sy hoogtepunt. Dit word geproduseer deur stofdeeltjies wat agterbly deur die komeet C / 1861 G1 Thatcher, wat in 1861 ontdek is. Die stort duur jaarliks ​​van 16-25 April. Dit bereik hierdie jaar 'n hoogtepunt in die nag van die 22ste en die oggend van die 23ste. Hierdie meteore kan soms helder stofpaaie lewer wat 'n paar sekondes duur. Die glans van die waksende maan sal baie van die flouer meteore in die aand blokkeer. Maar dit sal 'n paar uur na middernag vertrek en donker lug gee vir 'n goeie vroeë oggendprogram. Die beste besigtiging sal na middernag vanaf 'n donker plek wees. Meteore straal uit die sterrebeeld Lyra, maar kan oral in die lug verskyn.

28 April - Volmaan, Supermoon. Die maan sal aan die oorkant van die aarde geleë wees, aangesien die son en sy gesig heeltemal sal verlig. Hierdie fase vind plaas om 10:37 UTC. Hierdie volmaan het vroeë inheemse Amerikaanse stamme bekend gestaan ​​as die Pink Moon omdat dit die voorkoms van die mospienk of wilde grondflox, wat een van die eerste lenteblomme is, gekenmerk het. Hierdie maan staan ​​ook bekend as die Sprouting Grass Moon, die Growing Moon en die Egg Moon. Baie kusstamme het dit die Vismaan genoem, want dit was die tyd dat die skaduwee stroomop geswem het om te kuit. Dit is ook die laaste van drie supermoons vir 2029. Die maan sal naby die naaste aarde wees en lyk effens groter en helderder as gewoonlik.

6, 7 Mei - Eta Aquarids Meteor Shower. Die Eta Aquarids is 'n bogemiddelde stort wat tot 60 meteore per uur op sy hoogtepunt kan lewer. Die meeste aktiwiteite word in die Suidelike Halfrond gesien. In die Noordelike Halfrond kan die tempo ongeveer 30 meteore per uur bereik. Dit word geproduseer deur stofdeeltjies wat deur die komeet Halley agtergelaat is, wat sedert antieke tye waargeneem is. Die stort duur jaarliks ​​van 19 April tot 28 Mei. Dit bereik hierdie jaar 'n hoogtepunt in die nag van 6 Mei en die oggend van 7 Mei. Die kwynende sekelmaan sal vanjaar die flouer meteore versper. Maar as u geduldig is, moet u in staat wees om 'n hele paar helderder te vang. Die beste besigtiging sal na middernag vanaf 'n donker plek wees. Meteore straal van die sterrebeeld Waterman, maar kan oral in die lug verskyn.

13 Mei - Nuwemaan. Die maan sal aan dieselfde kant van die aarde as die son geleë wees en sal nie in die naghemel sigbaar wees nie. Hierdie fase vind om 13:43 UTC plaas. Dit is die beste tyd van die maand om flou voorwerpe soos sterrestelsels en sterretrosse waar te neem, omdat daar geen maanlig is om in te meng nie.

27 Mei - Volmaan. Die maan sal aan die oorkant van die aarde geleë wees, aangesien die son en sy gesig heeltemal sal verlig. Hierdie fase vind plaas om 18:38 UTC. Hierdie volmaan het vroeë inheemse Amerikaanse stamme bekend gestaan ​​as die Flower Moon omdat dit die tyd van die jaar was toe lenteblomme in oorvloed verskyn het. Hierdie maan het ook bekend gestaan ​​as die maanplantmaan en die melkmaan.

8 Junie - Mercurius tydens die grootste westelike verlenging. Die planeet Mercurius bereik die grootste westelike verlenging van 23,9 grade vanaf die son. Dit is die beste tyd om Mercurius te besigtig, aangesien dit op die hoogste punt bo die horison in die oggendhemel sal wees. Soek die planeet laag in die oostelike lug net voor sonop.

12 Junie - Nuwemaan. Die maan sal aan dieselfde kant van die aarde as die son geleë wees en sal nie in die naghemel sigbaar wees nie. Hierdie fase vind om 03:51 UTC plaas. Dit is die beste tyd van die maand om flou voorwerpe soos sterrestelsels en sterretrosse waar te neem, omdat daar geen maanlig is om in te meng nie.

12 Junie - Gedeeltelike sonsverduistering. 'N Gedeeltelike sonsverduistering vind plaas wanneer die maan slegs 'n gedeelte van die son bedek, soms soos 'n hap wat uit 'n koekie geneem is. 'N Gedeeltelike sonsverduistering kan slegs veilig waargeneem word met 'n spesiale sonfilter of deur na die son se weerkaatsing te kyk. Hierdie gedeeltelike verduistering sal sigbaar wees in die Noordelike Yssee, Skandinawië, Alaska, Noord-Asië en Noord-Kanada. Die verduistering sal die beste gesien kan word vanaf Kanada en Groenland met 'n dekking van 34%. (NASA-kaart- en verduisteringsinligting)

21 Junie - Junie Sonstilstand. Die Junie-sonstilstand vind om 01:53 UTC plaas. Die Noordpool van die aarde sal na die son kantel, wat sy noordelikste posisie in die lug sal bereik en direk oor die Kreefskeerkring op 23.44 grade noordbreedte sal wees. Dit is die eerste dag van die somer (somer sonstilstand) in die Noordelike Halfrond en die eerste dag van die winter (winter sonstilstand) in die Suidelike Halfrond.

26 Junie - Volmaan. Die maan sal aan die oorkant van die aarde geleë wees, aangesien die son en sy gesig heeltemal sal verlig. Hierdie fase vind om 03:23 UTC plaas. Hierdie volmaan was deur vroeë Indiaanse stamme bekend as die Strawberry Moon omdat dit die tyd van die jaar aangedui het om ryp te word. Dit val ook saam met die piek van die aarbeiseisoen. Hierdie maan het ook bekend gestaan ​​as die Rose Moon en die Honey Moon.

26 Junie - Totale maansverduistering. 'N Totale maansverduistering vind plaas wanneer die maan heeltemal deur die aarde se donker skaduwee, of umbra, gaan. Tydens hierdie soort verduistering sal die maan geleidelik donkerder word en dan 'n roesige of bloedrooi kleur kry. Die verduistering sal sigbaar wees in die grootste deel van Noord-Amerika en Europa en die hele Mexiko, Sentraal-Amerika, Suid-Amerika en Afrika. (NASA-kaart- en verduisteringsinligting)

11 Julie - Nuwemaan. Die maan sal aan dieselfde kant van die aarde as die son geleë wees en sal nie in die naghemel sigbaar wees nie. Hierdie fase vind plaas om 15:52 UTC. Dit is die beste tyd van die maand om flou voorwerpe soos sterrestelsels en sterretrosse waar te neem, omdat daar geen maanlig is om in te meng nie.

11 Julie - Gedeeltelike sonsverduistering. 'N Gedeeltelike sonsverduistering vind plaas wanneer die maan slegs 'n gedeelte van die son bedek, soms soos 'n hap wat uit 'n koekie geneem is. 'N Gedeeltelike sonsverduistering kan slegs veilig waargeneem word met 'n spesiale sonfilter of deur na die son se weerkaatsing te kyk. Hierdie gedeeltelike verduistering sal slegs in die suide van Chili en die suide van Argentinië sigbaar wees. (NASA-kaart- en verduisteringsinligting)

25 Julie - Volmaan. Die maan sal aan die oorkant van die aarde geleë wees, aangesien die son en sy gesig heeltemal sal verlig. Hierdie fase vind plaas om 13:36 UTC. Hierdie volmaan het vroeë inheemse Amerikaanse stamme as die Buck Moon bekend gestaan ​​omdat die manlike bokbokke op hierdie tyd van die jaar hul nuwe gewei sou laat groei. Hierdie maan het ook die Thunder Moon en die Hay Moon genoem.

28, 29 Julie - Delta Aquarids Meteor Shower. Die Delta Aquarids is 'n gemiddelde stort wat op sy hoogtepunt tot 20 meteore per uur kan lewer. Dit word vervaardig deur rommel wat deur komete Marsden en Kracht agtergelaat word. Die stort duur jaarliks ​​van 12 Julie tot 23 Augustus. Dit bereik hierdie jaar 'n hoogtepunt in die nag van 28 Julie en die oggend van 29 Julie. Die kwynende maan sal hierdie jaar baie van die flouer meteore blokkeer. Maar as u geduldig is, kan u dalk nog 'n paar helderder vang. Die beste besigtiging sal na middernag vanaf 'n donker plek wees. Meteore straal van die sterrebeeld Waterman, maar kan oral in die lug verskyn.

10 Augustus - Nuwemaan. Die maan sal aan dieselfde kant van die aarde as die son geleë wees en sal nie in die naghemel sigbaar wees nie. Hierdie fase vind om 01:56 UTC plaas. Dit is die beste tyd van die maand om flou voorwerpe soos sterrestelsels en sterretrosse waar te neem, omdat daar geen maanlig is om in te meng nie.

12 Augustus, 13 - Perseiden Meteor Shower. Die Perseïdes is een van die beste meteoorbuie wat gesien kan word, en lewer tot 60 meteore per uur op sy hoogtepunt. Dit word vervaardig deur komeet Swift-Tuttle, wat in 1862 ontdek is. Die Perseïdes is bekend vir die vervaardiging van 'n groot aantal helder meteore. Die stort duur jaarliks ​​van 17 Julie tot 24 Augustus. Dit bereik hierdie jaar 'n hoogtepunt in die nag van 12 Augustus en die oggend van 13 Augustus. Dit is 'n uitstekende jaar vir die Perseïede. Die dun, sekelmaan sal vroeg in die aand sak, en donker lug en optimale kykomstandighede vir 'n uitstekende vertoning. Die beste besigtiging sal na middernag vanaf 'n donker plek wees. Meteore straal vanaf die sterrebeeld Perseus, maar kan oral in die lug verskyn.

19 Augustus - Mercurius tydens die grootste oostelike verlenging. Die planeet Mercurius bereik die grootste oostelike verlenging van 27,4 grade vanaf die son. Dit is die beste tyd om Mercurius te besigtig aangesien dit op die hoogste punt bo die horison in die aandhemel sal wees. Kyk na die planeet laag in die westelike lug net na sononder.

24 Augustus - Volmaan, Blou Maan. Die maan sal aan die oorkant van die aarde geleë wees, aangesien die son en sy gesig heeltemal sal verlig. Hierdie fase vind plaas om 01:52 UTC. Hierdie volmaan het deur vroeë Indiaanse stamme bekend gestaan ​​as die Steurmaan omdat die groot steurvis van die Groot Mere en ander groot mere in hierdie tyd van die jaar makliker gevang kon word. Hierdie maan het ook die Green Corn Moon en die Graan Moon genoem. Aangesien dit die derde van vier volle mane in hierdie seisoen is, staan ​​dit bekend as 'n blou maan. Hierdie seldsame kalendergebeurtenis vind slegs een keer elke paar jaar plaas, wat aanleiding gee tot die term 'een keer in 'n blou maan'. Daar is normaalweg net drie volle mane in elke seisoen van die jaar. Maar aangesien volmane elke 29,53 dae voorkom, sal 'n seisoen soms 4 volle mane bevat. Die ekstra volmaan van die seisoen staan ​​bekend as 'n blou maan. Blou mane kom gemiddeld een keer elke 2,7 jaar voor.

8 September - Nuwemaan. Die maan sal aan dieselfde kant van die aarde as die son geleë wees en sal nie in die naghemel sigbaar wees nie. Hierdie fase vind plaas om 10:45 UTC. Dit is die beste tyd van die maand om flou voorwerpe soos sterrestelsels en sterretrosse waar te neem, omdat daar geen maanlig is om in te meng nie.

22 September - Volmaan. Die maan sal aan die oorkant van die aarde geleë wees, aangesien die son en sy gesig heeltemal sal verlig. Hierdie fase vind plaas om 16:30 UTC. Hierdie volmaan het deur vroeë inheemse Amerikaanse stamme bekend gestaan ​​as die maanmaan omdat die koring rondom hierdie tyd van die jaar geoes word. Hierdie maan staan ​​ook bekend as die Oesmaan. Die Oesmaan is die volmaan wat elke jaar die naaste aan die ewening van September voorkom.

22 September - September Equinox. Die equinox van September vind om 17:43 UTC plaas. Die son sal direk op die ewenaar skyn en daar sal bykans gelyke hoeveelhede dag en nag regoor die wêreld wees. Dit is ook die eerste herfsdag (herfs-ewening) in die Noordelike Halfrond en die eerste lentedag (lente-ewening) in die Suidelike Halfrond.

1 Oktober - Mercurius tydens die grootste westelike verlenging. Die planeet Mercurius bereik die grootste westelike verlenging van 17,9 grade vanaf die son. Dit is die beste tyd om Mercurius te besigtig, aangesien dit op die hoogste punt bo die horison in die oggendhemel sal wees. Soek die planeet laag in die oostelike lug net voor sonop.

2 Oktober - Neptunus by Opposisie. Die blou reuse-planeet sal op sy naaste benadering van die aarde wees en sy gesig sal volledig deur die son verlig word. Dit sal helderder wees as enige ander tyd van die jaar en sal die hele nag sigbaar wees. Dit is die beste tyd om Neptunus te sien en te fotografeer. As gevolg van sy uiterste afstand van die aarde, sal dit net in 'n klein blou kolletjie in al die sterkste teleskope verskyn.

7 Oktober - Nuwemaan. Die maan sal aan dieselfde kant van die aarde as die son geleë wees en sal nie in die naghemel sigbaar wees nie. Hierdie fase vind plaas om 19:15 UTC. Dit is die beste tyd van die maand om flou voorwerpe soos sterrestelsels en sterretrosse waar te neem, omdat daar geen maanlig is om in te meng nie.

7 Oktober - Draconids Meteor Shower. Die Draconids is 'n geringe meteoorreën wat slegs ongeveer 10 meteore per uur lewer. Dit word geproduseer deur stofkorrels wat deur die komeet 21P Giacobini-Zinner agtergelaat is, wat die eerste keer in 1900 ontdek is. Die Draconids is 'n ongewone stort deurdat die beste besigtiging vroegoggend in plaas van vroegoggend is soos die meeste ander buie. Die stort duur jaarliks ​​van 6-10 Oktober en bereik hierdie jaar 'n hoogtepunt in die nag van die 7de. Dit is 'n wonderlike jaar om die Draconids te besigtig. Die nuwemaan beteken donker lug en optimale kyktoestande vir 'n goeie show. Die beste besigtiging sal vroegoggend vanaf 'n donker plek ver van stadsliggies plaasvind. Meteore straal uit die sterrebeeld Draco, maar kan oral in die lug verskyn.

21, 22 Oktober - Orionids Meteor Shower. Die Orionids is 'n gemiddelde stort wat tot 20 meteore per uur op sy hoogtepunt lewer. Dit word geproduseer deur stofkorrels wat deur die komeet Halley agtergelaat is, wat sedert antieke tye bekend en waargeneem is. Die stort duur jaarliks ​​van 2 Oktober tot 7 November. Dit bereik hierdie jaar 'n hoogtepunt in die nag van 21 Oktober en die oggend van 22 Oktober. Ongelukkig sal die skittering van die volmaan hierdie jaar die meeste meteore belemmer. Maar as u regtig geduldig is, kan u nog steeds die helderste vang. Die beste besigtiging sal vanaf middernag vanaf 'n donker plek wees. Meteore straal vanaf die sterrebeeld Orion, maar kan oral in die lug verskyn.

22 Oktober - Volmaan. Die maan sal aan die oorkant van die aarde geleë wees, aangesien die son en sy gesig heeltemal sal verlig. Hierdie fase vind om 09:29 UTC plaas. Hierdie volmaan het vroeë inheemse Amerikaanse stamme as die Hunters Moon bekend gestaan, want op hierdie tyd van die jaar val die blare en die wild is vet en gereed om te jag. Hierdie maan het ook bekend gestaan ​​as die Reismaan en die Bloedmaan.

27 Oktober - Venus by die grootste oostelike verlenging. Die planeet Venus bereik die grootste oostelike verlenging van 47 grade vanaf die son. Dit is die beste tyd om Venus te besigtig, aangesien dit op die hoogste punt bo die horison in die aandhemel sal wees. Soek na die sonsondergang die helder planeet in die westelike lug.

4, 5 November - Taurids Meteor Shower. Die Taurids is 'n langdurige klein meteorietreën wat slegs ongeveer 5-10 meteore per uur lewer. Dit is ongewoon deurdat dit uit twee afsonderlike strome bestaan. Die eerste word geproduseer deur stofkorrels wat Asteroid 2004 TG10 agtergelaat het. Die tweede stroom word vervaardig deur rommel wat deur Comet 2P Encke agtergelaat is. Die stort duur jaarliks ​​van 7 September tot 10 Desember. Dit bereik hierdie jaar 'n hoogtepunt in die nag van 4 November. Die amper nuwe maan beteken donker lug vir 'n goeie vertoning hierdie jaar. Die beste besigtiging is net na middernag vanaf 'n donker plek ver weg van stadsliggies. Meteore straal uit die sterrebeeld Taurus, maar kan oral in die lug verskyn.

6 November - Nuwemaan. Die maan sal aan dieselfde kant van die aarde as die son geleë wees en sal nie in die naghemel sigbaar wees nie. Hierdie fase vind om 04:24 UTC plaas. Dit is die beste tyd van die maand om flou voorwerpe soos sterrestelsels en sterretrosse waar te neem, omdat daar geen maanlig is om in te meng nie.

13 November - Saturnus by opposisie. Die omringde planeet sal die naaste aan die aarde wees en sy gesig sal volledig deur die son verlig word. Dit sal helderder wees as enige ander tyd van die jaar en sal die hele nag sigbaar wees. Dit is die beste tyd om Saturnus en sy mane te besigtig en te fotografeer. Met 'n mediumgrootte of groter teleskoop kan u Saturnus se ringe en enkele van sy helderste mane sien.

17 November 18 - Leonids Meteor Shower. Die Leonids is 'n gemiddelde stort wat tot 15 meteore per uur lewer. Hierdie stort is uniek deurdat dit ongeveer elke 33 jaar 'n sikloniese piek het waar honderde meteore per uur gesien kan word. Die laaste hiervan het in 2001. Die Leoniede word geproduseer deur stofkorrels wat deur die komeet Tempel-Tuttle agtergelaat is, wat in 1865 ontdek is. Die stort duur jaarliks ​​van 6-30 November. Dit bereik hierdie jaar 'n hoogtepunt in die nag van die 17de en die oggend van die 18de. Die byna volmaan sal die meeste van die flouer meteore vanjaar weerhou. Maar as u geduldig is, kan u dalk nog 'n paar helderder vang. Die beste besigtiging sal na middernag vanaf 'n donker plek wees. Meteore straal uit die sterrebeeld Leo, maar kan oral in die lug verskyn.

21 November - Volmaan. Die maan sal aan die oorkant van die aarde geleë wees, aangesien die son en sy gesig heeltemal sal verlig. Hierdie fase vind om 04:04 UTC plaas. Hierdie volmaan het vroeër inheemse Amerikaanse stamme as die Beaver Moon bekend gestaan, want dit was die tyd van die jaar om die bevervalle te stel voordat die moerasse en riviere gevries het. Dit staan ​​ook bekend as die Frosty Moon en die Dark Moon.

5 Desember - Nuwemaan. Die maan sal aan dieselfde kant van die aarde as die son geleë wees en sal nie in die naghemel sigbaar wees nie. Hierdie fase vind plaas om 14:53 UTC. Dit is die beste tyd van die maand om flou voorwerpe soos sterrestelsels en sterretrosse waar te neem, omdat daar geen maanlig is om in te meng nie.

5 Desember - Gedeeltelike sonsverduistering. 'N Gedeeltelike sonsverduistering vind plaas wanneer die maan slegs 'n gedeelte van die son bedek, soms soos 'n hap wat uit 'n koekie geneem is. 'N Gedeeltelike sonsverduistering kan slegs veilig waargeneem word met 'n spesiale sonfilter of deur na die son se weerkaatsing te kyk. Hierdie gedeeltelike verduistering sal slegs in die uiterste suide van Chili, Suid-Argentinië en Antarktika sigbaar wees. (NASA-kaart- en verduisteringsinligting)

8 Desember - Uranus by Opposisie. Die blougroen planeet sal die naaste benadering van die aarde wees en sy gesig sal volledig deur die son verlig word. Dit sal helderder wees as enige ander tyd van die jaar en sal die hele nag sigbaar wees. Dit is die beste tyd om Uranus te besigtig. As gevolg van sy afstand, sal dit net in 'n klein blougroen kolletjie in al die sterkste teleskope voorkom.

13, 14 Desember - Geminids Meteor Shower. Die Geminids is die koning van die meteoorbuie. Dit word deur baie mense beskou as die beste stort in die hemel en lewer tot 120 veelkleurige meteore per uur op sy hoogtepunt. Dit word geproduseer deur rommel wat agtergelaat is deur 'n asteroïde bekend as 3200 Phaethon, wat in 1982 ontdek is. Die stort duur jaarliks ​​van 7 tot 17 Desember. Dit bereik hierdie jaar 'n hoogtepunt in die nag van die 13de en die oggend van die 14de. Die groeiende maan sal die meeste van die flouer meteore in die aand blokkeer. Maar as dit 'n paar uur na middernag sal plaasvind, laat donker lug en optimale omstandighede vir 'n uitstekende vroeë oggendvertoning. Die beste besigtiging sal vanaf middernag vanaf 'n donker plek wees. Meteore straal uit die sterrebeeld Tweeling, maar kan oral in die lug verskyn.

14 Desember - Mercurius tydens die grootste oostelike verlenging. Die planeet Mercurius bereik die grootste oostelike verlenging van 20,6 grade vanaf die son. Dit is die beste tyd om Mercurius te besigtig, want dit sal op die hoogste punt bo die horison in die aandhemel wees. Look for the planet low in the western sky just after sunset.

December 20 - Full Moon. The Moon will be located on the opposite side of the Earth as the Sun and its face will be will be fully illuminated. This phase occurs at 22:47 UTC. This full moon was known by early Native American tribes as the Cold Moon because this is the time of year when the cold winter air settles in and the nights become long and dark. This moon has also been known as the Long Nights Moon and the Moon Before Yule.

December 20 - Total Lunar Eclipse. A total lunar eclipse occurs when the Moon passes completely through the Earth's dark shadow, or umbra. During this type of eclipse, the Moon will gradually get darker and then take on a rusty or blood red color. The eclipse will be visible throughout all of North America, Mexico, Central America, South America, Africa, Europe, Asia, and Australia. (NASA Map and Eclipse Information)

December 21 - December Solstice. The December solstice occurs at 14:18 UTC. The South Pole of the earth will be tilted toward the Sun, which will have reached its southernmost position in the sky and will be directly over the Tropic of Capricorn at 23.44 degrees south latitude. This is the first day of winter (winter solstice) in the Northern Hemisphere and the first day of summer (summer solstice) in the Southern Hemisphere.

December 21, 22 - Ursids Meteor Shower. The Ursids is a minor meteor shower producing about 5-10 meteors per hour. It is produced by dust grains left behind by comet Tuttle, which was first discovered in 1790. The shower runs annually from December 17-25. It peaks this year on the the night of the 21st and morning of the 22nd. Unfortunately the nearly full moon will block most of the fainter meteors this year. But if you are really patient, you may still be able to catch a few good ones. Best viewing will be just after midnight from a dark location far away from city lights. Meteors will radiate from the constellation Ursa Minor, but can appear anywhere in the sky.


How to use EarthSky’s lunar calendar

EarthSky’s lunar calendar is a unique, beautiful poster-sized calendar printed in lush silver on deep blue, providing the phases of the moon for every day of the year, and noting each month’s new and full moons. It shows the moon waxing from new to full, and waning from full to new. It’s gorgeous. It’s the best gift ever! And it’ll help you get in touch with nature. What more could you ask? Read the six tips below and enjoy your moon calendar.

Moon phases for each day of the year on EarthSky’s lunar calendar.

1. First, get to know your calendar. The horizontal row at the top represents months of the year. The vertical rows to the right and left give you the date. Yep. It’s just that simple.

The lunar calendar shows every day in every month of 2021. Available now!

2. Enjoy the moon’s cycle. One cycle, from new moon to new moon, is called a lunar month or synodic month. The mean length of the phase cycle is 29.53059 days (29 days 12 hours 44 minutes), though in reality it can vary from about 29.3 to 29.8 days.

3. Each night, notice the moon’s phase. The phase of the moon will let you know if the moon will be out tonight, and when. At new moon: moon not visible (unless there’s a solar eclipse). At first quarter: moon lights up the evening hours, setting in the west around midnight. At full moon: moon stays out all night long. At last quarter: moon rises in the east around midnight, and can be found in the morning sky.

4. Realize that the moon is a world in space. Like Earth, it’s always half-lit by sunshine and half-engulfed in its own shadow. But the percentage of the moon’s daylight side that we see from Earth changes. The moon’s night side faces us at new moon, and its totally illuminated day side faces us at full moon. Die terminator – the shadow line dividing the lunar day from the lunar night – shows you where it’s sunrise on the moon as the moon waxes from new to full. It shows you where it’s sunset on the moon as the moon wanes from full to new.

Phases of the moon as it revolves around the Earth. Click here to see animation.

5. Collect ’em. Hold on to your EarthSky lunar calendars, even after the year has passed. If you post them on your wall side by side, they make a very cool wave pattern. Plus … consider that the ancients discovered that 235 lunar (synodic) months almost exactly equal 19 years. That means the phases of the moon will recur – or nearly recur – on the same calendar dates 19 years from now. Woot!

6. Order your EarthSky lunar calendar today and enjoy a newfound appreciation for the lunar month and the intriguing cycle of lunar phases.

A composite of various moon phases by EarthSky Facebook friend Jacob Baker. He wrote: “This is a composite of 8 separate photos taken over the past summer showing some various phases. All shots taken with my Meade 114mm reflector, 2X Barlow, CanonT3 at Prime Focus.”

Bottom line: Here’s why you need an EarthSky lunar calendar, top tips for using it, and a place to order one. Enjoy a newfound appreciation for the lunar month and lunar phases. Live by the moon!


New Moon

New Moon Rising?
The Cassini spacecraft may have captures a small new moon taking shape at the outer edge of Saturn's rings. This image shows a small, bright arc at the bottom of the rings. Planetary scientists say this could be ring material clumping together to form a new moon.

The Moon does not emit its own light, shining instead by reflecting sunlight. Depending on the relative positions of the Earth, Sun and Moon, varying amounts of the lunar surface appear to be illuminated.

New moons occur on Julian days
waar n 'n heelgetal is. The lunation number is defined such that lunation n = 1 corresponds to the new moon that occurred in 1923.

s of Uranus
Bykomende hulpbronne
Brent Gladman's Home Page.
The JPL Solar System Dynamics Page.

s for Jupiter
Institute for Astronomy
University of Hawaii
Honolulu, Hawaii .

and full moon happen nearly 30 degrees farther eastward as measured by the constellations of the zodiac in about 29.5 days. But the moon returns to its node a good two days earlier than that, or in about 27.2 days.

s
There have been many observations that seem to indicate additional small moons close to Saturn. None have been confirmed, however. Most if not all will probably turn out to have been observational flukes.
Facts .

How can I find out if the

has actually been sighted vs. just calculated or predicted.
There is an project called the Islamic Crescents' Observation Project which seems to do just what you're asking.

- when the moon's disk is dark (and invisible to us) because the moon is between the sun and the Earth
Quarter Moon - (also called half moon) when we can see one half of the moon's disk (this is one-quarter of the entire moon's surface) .

Phase of the moon during which none of the lunar disk is visible.
Newtonian mechanics The basic laws of motion, postulated by Newton, which are sufficient to explain and quantify virtually all of the complex dynamical behavior found on Earth and elsewhere in the universe.

:
Moon and Sun are on the same side of the sky.
Near side is in total darkness.
Moon and Sun rise together.

let, in white circle, orbiting Uranus, bottom left
Source: International Astronomical Union
22 moons in 2002. Uranus has more than 20 satellites.

is the only lunar phase during which an eclipse of the Sun can occur.

" If the Moon is on the same side of the Earth as the Sun, then the face of the Moon that can be seen from the Earth is no longer illuminated by the Sun's rays " as only the opposing side is facing the Sun. As a result, it is invisible in the Earth's sky.

, occurring every 29 or 30 days, is an important separately sanctioned occasion in Judaism and some other faiths.

s of Saturn were discovered in 2004.

. The phase in which the moon is in the same direction as the sun in Earth's sky, so it is unilluminated and invisible.
Newton, Isaac 1642-1727. The English cleric and scientist who discovered the classical laws of motion and gravity. The bit with the apple is probably apocryphal.

, the Moon is lined up between the Earth and the Sun. We see the side of the Moon that is not being lit by the Sun (in other words, we see no Moon at all, because the brightness of the Sun outshines the dim Moon!) When the Moon is exactly lined up with the Sun (as viewed from Earth), .

rises and sets along with the Sun at about the same time.

appears higher on the summer solstice than on the winter solstice, while the First Quarter Moon appears higher on the spring equinox than on the autumnal/fall equinox.

phase
Jul 22: Full Moon phase
Jul 22: Conjunction of Mars and Jupiter
Jul 28-29: Southern Delta Aquarids meteors .

: 6th
First Quarter: 14th
Full Moon: 21st
Last Quarter: 28th
Planete
- Mercury will appear as a pre-dawn object from the 6th of the month onwards, having passed between Earth and the Sun on the 27th of November, and by the 8th of the month, the little planet will shine at magnitude +0.0.

, and total eclipse of the Sun for parts of the Arctic, Siberia, and China. The eclipse is partial over most of Europe and Asia. Skywatchers in easternmost Canada also have a partial view right at sunrise. See eclipse prediction map - and afterward, check our homepage for eclipse reports as they come in! .

: lighted side of the Moon faces away from the Earth.
Waxing Crescent: a small part of the Moon appears lighted and grows larger on successive days.
First Quarter: the right half of the Moon appears lighted, with the lighted part growing larger on successive days.

Solar Eclipse 19 Gemini
A 'ring of fire' solar eclipse will bring a subdued sunrise to the northeast US and Canada on Thursday
How to watch the 'ring of fire' solar eclipse .

The sunlit half of the Moon is facing away from Earth. During this phase, the Moon is dark.
Waning Crescent Moon .

- (n.)
The phase of the moon when the side of the moon facing the earth is the side that is not illuminated by sunlight.
Newtonian telescope - (n.) .

. However, because the moon is between Earth and the Sun the Sun only illuminates the face that we do not see, the 'Far Side of the Moon'. The face that we normally look at is in total darkness and therefore we cannot see it.

See phases of the moon
Next Generation Space Telescope (NGST) International successor to the hubble space telescope. The US$2 billion NGST will be an 8-m (26-ft) class instrument combining visible and infrared astronomy. It will orbit at the L2 Lagrangian point between the Earth and the Sun, 1.5 million km (0.

The phase of the moon when it is nearest the Earth-Sun line, hence invisible from Earth because of the Sun's glare.
newton .

phase is when the moon is directly between the sun and the Earth. The moon's illuminated half is facing away from the Earth making the moon not visible from Earth. Due to the lack of light in the night sky, this is the best time to see stars and constellations.
Crescent .

, the Sun and Moon are seen from the Earth against the same background stars. One sidereal period later, the Moon has returned to the same place in its orbit and to the same place among the stars, but in the meantime, the Sun has been moving eastward, so the Moon has not yet caught up to the Sun.

is in line with the Sun, so it does everything exactly when the Sun does its stuff - rises at 6 AM, sets at 6 PM, and on the meridian at Noon.
2. Full Moon does everything at opposite times relative to the Sun - rises at 6 PM, sets at 6 AM, and is highest (on the meridian) at Midnight.
3.

, we do not see the Moon in our sky at all.

was 239,000 mi/384,000 km away from Earth but it was in a molten state. Within around 100 million years a majority of the "magma ocean" had become crystalized and the rocks that were less dense floating towards the top and eventually creating the crust of the lunar surface.
Structure and Surface: .

, salty water on Mars, interstellar travel and black trees on a world with two suns look back over the year as we count down the most read news stories of 2011.
10. New images of
beta Pictoris planet .

. The Moon will be directly between the Earth and the Sun and will not be visible from Earth. This phase occurs at 22:45 UTC.

s of Uranus, was unable to detect them.

set?
When is the first quarter Moon overhead?

s since Jan 1923-01-17 02:41 UTC. New Mon on 26-Oct-2011 is start of Lunation 1099.
Incorporated association 41059 (QLD) ABN: 76 387 896 336
Designed by DP Technologies.

. As it moves away from the sun, we can see it as a thin crescent, and then as a half-lit disk. It is then 90 degrees from the sun.

The moon at conjunction, when little or none of it is visible to an observer on the earth because the illuminated side is away from him. Also called change of the moon. See phases of the moon.

takes 29.5 days, a period adopted as the basis of our calendrical month.

For instance, the orbital period of the Moon was stated to be "about" one month. In fact, the length of the "lunar month" from one

to the next (or from one full Moon to the next) is 29.53 days, but the Moon's orbital period is actually 2.

s of Neptune
The six newly-discovered moons orbit with direct motion nearly in the equatorial plane. Most are closer to Neptune than its rings. Because this lies inside the Roche limit, these moons could not have formed by accretion in their present location.

, our satellite has traveled around to the other side of its orbit, and the side facing us also faces the Sun and is fully illuminated as we see it that phase is called "Full Moon.

and before Songsnight are not part of the regular calendar year. A new night is reckoned to begin at midday day-night cycles are divided into 36 parts Watches, roughly equal to a Terragen hour.

of Earth mean solar time passes at a constant rate, unlike apparent solar time meridian a great circle on the terrestrial or celestial sphere that passes through the poles phases of the Moon the different appearance of light and dark on the Moon as seen from Earth during its monthly cycle, from

This doesn't happen every single month because the orbit of the moon is inclined just enough that most months, if you were to draw a line from your eyeballs to the sun through the

, the moon would actually not be on that line.

marks the beginning of a lunation or lunar month. Waxing Crescent After the new phase, the Moon becomes visible as a crescent, trailing the Sun across the sky and seen during the day. The crescent gets a little fatter each day. First Quarter The Moon is half lit.

Initial observations suggest the

s appear to be in "resonance" for every 12 times that Charon circles Pluto, P2 orbits three times and P1 twice. (More at hubblesite.org and at Astronomy Picture of the Day.

Surprisingly enough, while weather was really unstable earlier (during

), it got really clear for a number of nights around and after First Quarter. On one of those clear late afternoons, March 19, I have decided to try hunting down as many Messier objects as possible with my CCD camera.

The Lunisolar calendar always has the

on the first day of a month, and the Full Moon on the 15th day and uses a form of the Metonic cycle.

The first stage in the cycle is the

. This stage is when the Moon is completely covered in shadow. From this stage, the amount of illuminated Moon which is visible from the Earth increases this is known as waxing. The waxing crescent stage is a growing crescent of illuminated Moon.

The Cassini space probe discovered eight

s of Saturn from 2004 to 2009. The primary mission of Cassini space probe ended in 2008. The probe's mission was extended to September 2010 and then extended again to 2017, to study a full period of Saturn's seasons.

A solar eclipse occurs during a

, when the Moon is between the Sun and Earth. Since they are the same apparent size in the sky, the moon can either partially block the Sun (annular eclipse) or fully block it (total eclipse).

Timed to coincide with the

, our unique itinerary includes specially arranged stargazing sessions in Sonoran Desert locations. Add in the stunning Grand Canyon and the red-rock formations around Sedona, and you have a Southwest adventure designed for sky watchers of every level of expertise and interest.

lunation - the time elapsed from one

to the next). In the year 2000, the average length of a lunation was 29.530588 days (or 29 days, 12 hours, 44 minutes, and 3 seconds). However, the length of any one synodic month can vary from 29.26 to 29.

18. A total solar eclipse occurs only during a

, which is when the moon sits directly between the Earth and the Sun.
19. Radiations of the Sun are in two forms, electromagnetic (photons) and particle (electrons, protons, alpha particles, etc.) radiation.

. 5 A.M. EDT: The June Bootid meteor shower is at peak activity.
June 28 - 11 P.M. EDT: The Moon is 5 south of Jupiter.
June 30 - 3:10 P.M. EDT: The Moon is at apogee, the point in its orbit when it is farthest from Earth.

Epact: the age of the Moon: the number of days since

, diminished by one day, on January 1 in the Gregorian ecclesiastical lunar cycle. (See Gregorian calendar: lunar phases.)

Ephemeris: a tabulation of the positions of a celestial object in an orderly sequence for a number of dates.

"Where to, Number One?"
"You're the captain, Captain."
"I hear we discovered a

at Edrin II."
"That we did, sir."
"Thank You, Number One. In that case, let's give her a spin. That sound good to you, Mr. Spock?"
"Yes, Captain. Let us see what the future holds."
"Ready for warp, sir."
"Hit it." .

solar eclipse -- the passage of the

directly between the Sun and the Earth when the Moon's shadow is cast upon the Earth. The Sun appears in the sky either partially or totally covered by the Moon.

Cyclically recurring apparent forms of the Moon.

, First Quarter, Full Moon, and Last Quarter are defined as the times at which the excess of the apparent celestial longitude (see Longitude, Celestial) of the Moon over that of the Sun is 0 , 90 ,180 , and 270 , respectively. [S92]
Lunation .

The Moon has played a vital role in the formation of our Calendar. The word "month" comes from a root word "moon" or "moonth," the time it takes the Moon to go from

. A close look at the history of the Calendar can be found at the NASA/Goddard Space Flight Center.

There are two high tides and two low tides each day. Tydens

and Full Moon the difference between high and low tides is more extreme. Those are called spring tides. During First Quarter and Last Quarter phases of the Moon the difference between high and low tides is less extreme. Those are called neap tides.

A solar eclipse can only happen when the Moon is in the

position, and can only be observed for a few moment by observers in a small strip of Earth's surface called the path of totality. Outside the path of totality is a larger region where a partial solar eclipse can be observed.

When the Moon is between the Earth and the Sun (1), the near side of the Moon is the dark side. The Moon cannot be seen. We call this

, the beginning of a new cycle of lunar phases. When the Earth is between the Sun and the Moon (5), the near side is the light side.

Is the season when the Sun is close enough to a node for an eclipse to occur, An eclipse season is 32 days. Any

during this period will cause a solar eclipse. For Lunar eclipses the period is shorter only about 22 days. A full moon occurring during this time will cause a lunar eclipse.
Eclipse Year .

- Planet - large body that shines by reflected light orbiting a star
- Star - hot gas held together by gravity
- Supernova - the blast wave that signals the end of a star's life when its nuclear fuel is
exhausted and the core collapses
- Waning - period between full moon and

Waxing Crescent - The Moon's crescent phase that occurs just after

Weight - The gravitational force exerted on a body by the Earth (or another astronomical object)
White Dwarf - A small, dense star that is supported against gravity by the degenerate pressure of its electrons .

Lunation
The interval of a complete lunar cycle, between one

and the next. A lunation is equal to 29 days, 12 hours, and 44 minutes.
M .

"The moons form a series of neatly nested orbits, a bit like Russian dolls," said Dr Mark Showalter of the SETI Institute in Mountain View, leader of the scientific team that discovered the

.
The Pluto team is intrigued that such a small planet can have such a complex collection of satellites.

Cassini was launched in 1997 and arrived in orbit around Saturn in 2004. During its 13-year mission (over three times its planned length), Cassini discovered and imaged

s orbiting Saturn and collected data about the planet's clouds and ring system.

A solar eclipse occurs when the Moon passes between the Sun and the Earth so that the Sun is wholly or partially obscured. This can only happen during a

, when the Sun and Moon are in conjunction as seen from the Earth.
. German astronomer Erwin Finlay-Freundlich
Erwin Finlay-Freundlich .

Earthshine - reflected earthlight visible on the Moon's night side when the Moon is in the evening or morning crescent phase Earthshine is also known as the Moon's ashen glow or as the old Moon in the

's arms for examples, see Earthshine .

His theory gave reasonably satisfactory results for the motion at Full and

. Hipparchus was dissatisfied however, for, as he appreciated, the errors at quadrature (when the Moon stands at first and last quarters) were too great.

The word is usually used in context with the Sun, Earth, and the Moon or a planet, where the latter is in conjunction or opposition. Solar and lunar eclipses occur at times of syzygy, as do transits and occultations. The term is also applied to each instance of

or Full Moon when Sun and Moon are in .

the solar system, a conjunction is an alignment of two bodies as seen from the Earth. Planetary conjunctions involve the Sun (the hour angle is that of the Sun). In an inferior conjunction the planet lies between the Sun and the Earth in a superior conjunction the planet lies on the far side of the Sun. Die


What phase of moon rules out deep sky?

Just wondering if people have rules of thumb for deep sky observing during times outside a new moon? I try and go to my dark sky site on weekends of third quarter and new moon, but trying to expand opportunities. In the first quarter, what illumination level of the moon would begin to degrade deep sky observing? Tonight, Astropheric says there the moon will be 22% illumination. Too much for deep sky? or what is the limit you think is acceptable to have a moon in the sky and still do decent deep sky observing?

# 2 Augustus

I find that once it's past first quarter deep-sky objects really suffer.

#3 leveye

Wait till it's not out or below or under the horizon. Your best bet unless your shooting mono.

Edited by leveye, 19 May 2018 - 11:29 AM.

#4 Migwan

I would think it depends on when and what you want to view. I don't tend to chase galaxies when the moon is near full. If the moon is waxing, then later in the night after the moon goes down I might sneak out late or get up early. If the moon is waning I might retire early.

I have found that some targets are fun to look at, even if the moon is out, when seeing would otherwise be good. Closer globs and planetary nebula come to mind.

That said, I usually don't plan to go out within three or four nights either side of the full moon. Doesn't mean I won't go out on a whim and scratch the itch that the recent cloudy whether has caused to flair up. You know, when I have been spending too much time here.

Edited by Migwan, 19 May 2018 - 11:35 AM.

#5 Hesiod

It depends a lot also on Sun setting/rising time by June, I feel comfortable with New Moon or waxing moon until first quarter, by December even a third quarter waning moon can be worth an attempt.

It goes without saying that much depends also on how long it takes to reach the "dark site": if it is very close, even getting up early after a gibbous waxing moon is set could net a few hours of dark when days are shorts

#6 psyhiker

Thanks all. It takes me 90 minutes to get to my dark site, all freeway driving and easy mountain road. and work and family will get in the way of using new moon or third quarter weekends, so I was weighing the drive vs moon shine (the one in the sky) in the first quarter, just to have another chance at observing. For this month, my deep sky objects are galaxies and globulars, and Jupiter of course. The moon isn't setting until 11 tonight, I think, maybe I will wait until the new moon in June. The risk there is some life event getting in the way or cloudy nights

#7 Starkid2u

Yeah, what they said. Seriously, I'm of the mind that anytime before the 1st quarter is O.K., except for galaxies. With a waning Moon, I just call it a night a little earlier, that's all.

#8 CharlesW

Some professional observatories use 60 degrees of separation from the object to the moon for LRGB and O. Thirty degrees for H and S. DSO Browser allows you to set those limits as a filter.

#9 sg6

Maybe not specifically deep sky but I would almost say that if the sky is clear and you have and want to go viewing then head out and do some observing.

There is likely not much opportunity to do consistant observing so don't throw away the oportunities that arise. Search out whatever DSO's are away from the Moon and that are additionally "bright".

I never really think about the moon, other then something to observe. If the moon is indicated then I make note of it and pick out objects somewhat away from it. I do however still note those around the moon just in case for some reason objects are easily apparent.

Edited by sg6, 19 May 2018 - 01:34 PM.

#10 Exnihilo

To me, about 20% is the limit. But you can always just wait until it sets.

#11 Jon Isaacs

Galaxies require dark skies. How late are you willing stay up ?

As others have said , observe after the moon set . Brighter globulars and other until then ..

#12 aeajr

If the moon is past first 20% and high in the sky I don't know that it would be worth the run of 90 minutes to go to a dark site as it won't be that dark. Save the dark site runs for when the moon is not in the sky or is les than 20% illuminated and not in the part of the sky where you will be observing.

Observing from home, sure! But save the dark site for when it is dark.

#13 bumm

For me, dim fuzzies aren't much worth viewing from first quarter until a few days after, depending on the time between sunset and moonrise.

# 14 Jon Isaacs

For me, dim fuzzies aren't much worth viewing from first quarter until a few days after, depending on the time between sunset and moonrise.

Marty

Being retired and having a small second home in the high desert where the skies are reasonably dark and most often clear, I generally head out that way just about the third quarter moon and leave a few days prior to the first quarter moon. I try to plan my sleep schedule around the moon. Once there is less than about 3 hours between moon set and astronomical dawn, I've had my fill and I read for some civilization.

For a trip, I would look at that time between moon set and astronomical dawn and then decide whether it was enough to make it worth while. There are definitely interesting DSOs to observe even when the moon is up but whether it's worth 3 hours of driving is the dilemma.

If one is really hungry for some DSOs.. I'd go for it. In March, the grandchildren's spring break coincided with the full moon. I still took a scope or two and just adjusted my expectations in accordance with the moon.

#15 Redbetter

I don't go by quarter phase specifically. I look up moon rise and moon set. Through 1st quarter if the moon sets before midnight, then I can justify a trip out to a dark site to observe (assuming that the weather isn't dicey for getting clear sky.)

On the other end of the lunar cycle I will often head to a dark site if the moon will rise after midnight. This depends on time of year, DST, and what it looks like the weather will do in the ensuing nights. If I can get in two good hours of dark sky, that is about the minimum. I will take that minimum if I am in DSO withdrawal, if subsequent nights are forecast to be overcast, or if there are some planets/other brighter sky objects that are favorably placed that I want to observe. The seeing is better at my dark site than in the backyard so I prefer to do planetary there, making it easier to justify a shorter DSO session.

#16 MP173

My observing spot is the patio, just outside the sunroom, where my ETX90RA is at the ready. My scope does not pull in galaxies or g/c very well and I seem to have gravitated to binaries and open clusters.

Back on April 30th we had a 99% moon and since I had not been observing since April 4th and with temperature at 68 degrees. it was a no brainer.

With lowering of the expectations and easing of my observing plan, I had a great session. I tended to go after wide, bright doubles and observed seven such objects in an hour all in Hydra area, a new frontier for me.

Challenging yes, but it was well worth getting back out again.

I sure wouldnt have done that on a week night with work the next morning if a drive of 30 minutes to a dark site would have been involved. but the five minute setup time worked.


Your rules for phase of the moon observing?

I did a brief search for this topic, certainly there must be many, many similar discussions, but I didn't know where to start.

Informal poll: What is your general rule for picking an observing night (deep sky, not solar system)?

Obviously the night closest to the new moon, but what is your rule or preference for observing near the last quarter or first quarter?

There is 3/4 of a month that is not "ideal", but only one week that is really bad. During the rest the moon either sets early enough or rises late enough to not get in the way.

Do you prefer to scavenge the early setting last quarter or plan an early night in the first quarter?

#2 Kidastronomer

Every night is good exept the 4 days before and after Full Moon.

#3 GlennLeDrew

#4 GeneT

Every night is good exept the 4 days before and after Full Moon.

In addition to the phase of the moon, check the rise and set times.

#5 sewhite

The +/- 4 day rule is about what I do, but on occasion the weather turns great and I need a fix, so out I go.

#6 woodscavenger

Any day is good. when you include the moon in your plan!

#7 Philler

Since I almost always do deep sky observing from dark skies, I try to get clear nights in about a 14 day window from about the last quarter moon to the first quarter moon. This month Jan., '15 for example, that would be about from the 12th (moon rise 0034) to the 25th (moon set 2354). Hopefully I can get 3 or 4 nights that I will be sure that will be clear and show clear and transparent on the clear sky charts. I will adjust my time period of observing for when the moon is not in the sky (around the new moon) or will only be present an hour or so either rising or setting depending on its phase. That may mean getting started early and quitting maybe midnight or 1 am, or arriving late near when it is near to setting and doing most of my observing in the AM hours.

Edited by Philler, 03 January 2015 - 01:29 AM.

#8 Jon Isaacs

As Gene says, check the rise and set times.

Every night is good exept the 4 days before and after Full Moon.

In addition to the phase of the moon, check the rise and set times.

I plan my observing around the rise and set times, when the moon is waxing, I do an hour or so after sunset and then sleep until the moon sets, when it's waning, I observe until moon rise. How close to the full moon I will push it, it depends on the situation. From my backyard, I'll give it a go most any clear night. If I happen to be at our place out in the mountains, I will give it a go most any clear night.

In terms of planning, I follow Gene's suggestion, I look at Astronomical Twilight and compare it to moon rise and moon set. Currently Astronomical Twilight is at about 6:30PM so if the waning moon rise at 9:30pm or later, that gives me a good three hours of dark skies and that is enough to make a trip worthwhile. When the moon is waning, it gets better with each successive night so as long as the weather looks promising, I give it a go and make the 70 mile drive. Currently, the full moon is on January 5th, on the 9th, the moon rises about 9:20 pm so I would be good to go on the 9th.

If the moon is waxing, I am much less likely to push it. If it sets much after 2 am, I am unlikely to get out of a warm bed, get dressed and face the cold.. And too, when the moon is waxing, each night it gets later and later each night and most likely I will have been out in the mountains for several nights and I have already enjoyed several nights under dark skies, time to head back to the city.

#9 Tony Flanders

Obviously the night closest to the new moon, but what is your rule or preference for observing near the last quarter or first quarter?

Spoken like someone from Southern California! In most parts of the world, one doesn't "pick an observing night" it would be more appropriate to say that the observing night picks me! It's not like I can order up a clear night during any given Moon phase. On the contrary, it's quite common to be clouded out for an entire month here in the Northeast. Any time I chose nie to go out on a clear night, I'm wasting a precious resource.

A better question is what I will choose to observe on the rare nights when it's clear. There are two separate cases: when I'm at my city home and when I'm at a reasonably dark site.

Regardless, the week surrounding full Moon is pretty bad for deep-sky observing. That means the Moon will be above the horizon pretty much all the time the sky is fully dark, and it will be bright enough to degrade deep-sky observing even in the city, where the skies are already glowing bright without the Moon.

Likewise, the week surrounding new Moon is fine for deep-sky observing, assuming that it's clear. The Moon will set before the night is well under way, and in any case a 3-day-old Moon is barely bright enough to mess up the sky even at a pristine site.

I do most of my observing in the evening, which means that the Moon is absent when it's in its waning phase, from roughly 4 to 15 days after full Moon. Very early in that time, my sessions may be quite short at a dark-sky site, because the Moon rises not long after the sky is fully dark. In the city, a 4- or 5-day old Moon isn't bright enough to make the already bright sky significantly brighter, except right near the Moon.

During the waxing phase, from roughly 4 to 12 days after new Moon, I will do deep-sky observing in the city, making sure to observe on the side of the sky opposite the Mon. But at a dark site, I will either skip deep-sky observing entirely, or (more rarely) get up before dawn, after the Moon has set.


The spring equinox is significant because after a long and dark winter, the hours of day and night are equal for the first time this year – about 12 hours each.

Astronomically speaking, the equinox falls on March 19 or 20 every year, marking spring’s beginning in the Northern Hemisphere (whereas it announces fall’s arrival in the Southern Hemisphere). The equinox happens at the same moment worldwide, even if our clock times reflect a different time zone.

http://www.almanac.com/content/spring-equinox-2017-first-day-spring

The vernal equinox is the astrological name for the spring equinox. It marks the moment the sun crosses the equator from south to north. It occurred at 10.29 GMT.

At the Vernal Equinox, the Sun crosses the celestial equator on its way north along the ecliptic.All over the world, days and nights are approximately equal. The name equinox comes from Latin words which mean “equal night”—aequus (equal) and nox (night). Enjoy the increasing sunlight hours, with earlier dawns and later sunsets.

http://www.mirror.co.uk/science/vernal-equinox-2017-weird-traditions-10001385

On the equinox, Earth’s two hemispheres are receiving the Sun’s rays about equally because the tilt of the Earth is zero relative to the Sun, which means that Earth’s axis neither points toward nor away from the Sun. (Note, however, that the Earth never orbits upright, but is always tilted on its axis by about 23.5 degrees.)

Enter http://www.almanac.com/content/spring-equinox-2017-first-day-springaption

The equinox differs from the solstices, which occur twice yearly to mark the sun’s most northern or southern position relative to the equator. This year, the summer solstice falls on Wednesday, 21 June, while the winter solstice is on Thursday, 21 December.

Scientific explanation aside, our ancestors were more connected to the Sun than we are today. They observed its pathway across the sky they tracked how the sunrise, sunset, and daylength changed, using the Sun (and Moon) as a clock and calendar. If you have ever been to Stonehenge or Machu Picchu, you’ll see examples of ancient seasonal markers.

Ostara is the name given by Pagans and Wiccans to the spring equinox and is one of the eight ‘sabbats’ – periods they believe make up the year. Some observers believe the event is a revival of ancient celebrations of spring, which merged into Easter after the spread of Christianity in the British Isles. Modern observers often see in Ostara at Stonehenge, in a similar fashion to the summer and winter solstices.