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.
Watan teras yana rufe zagayowar matakan haske: bayan shi sai siririn wata mai raguwa kawai da sabon wata na gaba. Watan «safiya» ne, wanda masu tashi da sassafe ke gani, ba masu kwana da dare ba.
Jometry na watan teras
Wata yana kusan kashi uku cikin hudu na zagayowar wata tun sabon wata: tsawonsa a sararin samaniya yana kusan 90° yamma da Rana. Ana ganin rabin hagu na faifai (Arewacin Duniya), dama na cikin inuwa.
Shekarun falaki kusan kwanaki 22.1 ne, haske a lokacin teras kusan 50% ne, sannan yana raguwa kowace rana zuwa siriri. A lunar.day katin rana yana nuna lambar ranar wata, ba shekarun falaki ba.
Jadawali: watan safiya
| Abin da ya faru | Lokaci (kusan) |
|---|---|
| Fitowar wata | Kusan tsakar dare |
| Kololuwa | Da asuba, daukake a kudu |
| Faduwar wata | Kusan tsakar rana |
Da yamma babu wata — sararin sama duhu yake nan da nan bayan faduwar Rana. Wannan dacewa ne don lura a rabin farko na dare. Zuwa safe wata yana hawa kuma yana haskakawa har tsakar rana, yana dushewa a sararin rana.
Madubin watan farko
| Ma'auni | Watan farko | Watan teras |
|---|---|---|
| Shekarun falaki | ~kwanaki 7.4 | ~kwanaki 22.1 |
| Mai haske | ~50%, gefen dama | ~50%, gefen hagu |
| Yanayi | Yana karuwa zuwa cikakken wata | Yana raguwa zuwa sabon wata |
| Ganin | Rana + yamma | Dare + safiya |
| Fitowa / fadowa | Tsakar rana / tsakar dare | Tsakar dare / tsakar rana |
A sauƙaƙe a tuna: teras-teras kishiyoyi ne a komai sai kashi.
Layin raba haske ya dawo aiki
Kamar na farko, watan teras yana sanya layin raba haske ta tsakiyar faifai — inuwa dogaye, kyakykyawan yanayin ramuka. Bambanci kawai gefen mai haske ne: yanzu gefen hagu na faifai da ake gani yana da haske, yayin da a watan farko dama ce mai haske.
Siririn wata mai raguwa: karshen zagayowa
Bayan watan teras rabon haske yana narkewa: siririn wata mai raguwa yana kara siriri kuma yana fitowa kara jima, har ya hade da asuba kwana 1–2 kafin sabon wata. Zagayowa ta rufe.
Yadda ake bin teras a lunar.day
Shafin moon/phase/[kwanan wata] yana nuna dabi'u na ranar da aka zaba. Duba haske kusa da 50% da fitowa kusan tsakar dare — wadannan alamomin watan teras ne.
Kammalawa
Watan teras — kusan 50%, rabin hagu, watan raguwa na dare da safiya. Madubin watan farko kuma mataki na karshe kafin sabon 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.
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.
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.