Farkon kwata: rabin faifa da Watan maraice
Takaitaccen amsa: farkon kwata shine matakin da rabin dama na faifan ke da haske (a arewacin duniya). Ana ganin Wata rana da maraice kuma yana faɗuwa kusa da tsakiyar dare. Kimanin kwata na zagayowar synodic daga sabon wata zuwa cikakke.
Farkon kwata shine ci gaban rabin farko na zagayowa: Wata ya sauya daga jinjiri zuwa rabin faifa kuma yana ci gaba da girma. Mataki mafi dacewa don kallo da na'urar hangen nesa.
Lissafin farkon kwata
Wata yana kimanin kwata na zagayowar synodic daga sabon wata: longitude-nsa kimanin 90° gabashin Rana. Muna ganin kimanin rabin rabin mai haske: gefen dama na faifan yana haske, hagu a inuwa (a arewacin duniya).
Shekarun falaki kimanin kwanaki 7.4, haske ~50% a lokacin kwata, sannan yana girma kowace rana zuwa convex. A lunar.day katin rana yana nuna lambar ranar wata, ba shekarun falaki ba.
Jadawali: Watan maraice
| Lamarin | Lokaci (kimanin) |
|---|---|
| Fitowar Wata | Kusa da tsakar rana |
| Kololuwa | Faɗuwar rana, sama a kudu |
| Faɗuwar Wata | Kusa da tsakiyar dare |
Ana ganin Wata rana (faifan kodadde) da dukan maraice. Bayan tsakiyar dare sama ba ta da gurɓatar hasken wata — dace da kallon sararin samaniya mai zurfi rabin dare na biyu.
Terminator: me ya sa masana falaki ke son kwata
Iyakar haske da inuwa (terminator) a kwatoci yana wucewa ta tsakiyar faifan. Tare da terminator inuwar ramuka da duwatsu sun fi tsayi — ana karanta ƙasa mafi kyau. Don haka:
- farkon kwata lokaci mafi kyau don ganin ramuka da binocular da na'urar hangen nesa;
- hotuna tare da terminator sun fi bambanci;
- cikakken wata don ƙasa akasin haka mafi muni — haske yana faɗuwa tsaye, babu inuwa.
Farkon kwata vs jinjiri mai girma vs convex mai girma
Rudani na suna akai-akai:
| Mataki | Haske | Yanayi |
|---|---|---|
| Jinjiri mai girma | 0–50% | Girma zuwa kwata |
| Farkon kwata | ~50% | Ci gaba |
| Convex mai girma | 50–100% | Girma zuwa cikakke |
«Kwata» na nufin kimanin kwata na zagayowar synodic da bambancin longitude ~90°, ba «kwatan faifan» ba. Rabin da ake gani kimanin rabin ɓangaren mai haske ne.
Yadda ake kallon kwatoci a lunar.day
Shafin moon/phase/[rana] yana nuna dabi'un ranar da aka zaɓa. Duba haske ~50% da faɗuwar Wata kusa da tsakiyar dare — alamar farkon kwata ne.
Taƙaice
Farkon kwata — ~50%, rabin dama, Watan maraice mai girma. Alamar rabin hanya zuwa cikakke da taga mafi kyau don nazarin ƙasan Wata.
Abubuwan da suka danganta
Menene zagayen yanayin wata
Takaitaccen amsa: yanayin wata su ne yadda rabin watan da rana ta haskaka yake daga Duniya. Cikakken zagaye (watan haɗuwa) yana ɗaukar kwanaki 29.53: daga jinjirin wata ta farkon kwata da cikakken wata zuwa kwata na ƙarshe.
Watan Teras: rabin faifai da watan safiya
Amsa a takaice: watan teras shi ne matakin da rabin hagu na faifai ke da haske (a Arewacin Duniya). Wata yana fitowa kusan tsakar dare kuma ana ganinsa da safe. Wato kusan kashi uku cikin hudu na zagayowar wata tun sabon wata.
Hasken wata, shekarunsa da nisansa: ma'anar alamomi
Amsa a takaice: haske shi ne rabon faifai da ake gani da hasken Rana ya mamaye (0–100%); shekarun falaki lokaci ne tun sabon wata; nisa hanya ce zuwa wata. Alamomi ne daban-daban: suna taimakawa wajen bayyana mataki, matsayi a zagayowa da girman gani, amma ba sa cikakken kayyade yanayin lura.