Ngemazinye amasekhethi 29.53, Elanga ligcoba isikhathi esingazidlalela sekhwele — kusukela kumkholi omntsha ngxenye omkholi ophakamisile futhi emuva. Ikhwele lezi liguqala abantu eminyakeni eyiwela eyisigwebo, nokobukhuthaza, nekalendu amahaya. Namuhla, Moon Phase Calendar kusisizakala ukulibuka yakhiwele elimahle elingaqonda isikhathi eliqiniso okubhalwe kusetshenziswa i-algorithm ye-astronomy.
Isikhathi Elangeni Line Ikhwele
Elanga akukhanyi lakuyo — licola ehehe lokusela umholi. Njengoba Elanga lihamba umhlaba, izingatsi ezehlukile zompilo wakuyo womhlaba, okwenza isikhathi sekhwele.
Nganoma nini, umkeli womhlaba uwulandelana nomkeli womhlaba (umkeli onomhlaba omholi). Ikhwele esiyibukayo kutibekela kuimibuzo phakati komholi, umhlaba, nelanga. Ekuseni umkholi uni umhlaba nomholi, sibukela umkeli wakuyo — umkholi omtsha. Ekuseni umhlaba uni umkholi nomholi, sibukela umkeli womhlaba ngokuphelele — umkholi ophakamisile.
Ikhwele Elangeni Engathathu Zesikhathi Solanga
New Moon — Elanga lini umhlaba nomholi. Umkeli womkholi othandanisa umholi. Elanga likumnyama (0% okokuhlanganisela). Lokhu kuqala usuku 0 lwesikhathi solanga.
Waxing Crescent — Ilinye elihle lomkholi libukeka okhunhleni wasekunene lomkholi (eNorthern Hemisphere). Okokuhlanganisela kukhula kusukela 0% kuya 50%. Ilinye lomkholi lubonakala cishe sekuseni.
First Quarter — Umsuka womkholi baliwa (50%). Ngakho isikhathi "quarter," isuka yomkholi ibonakala — ibizwa "first quarter" ngenxa yokuthi umkholi une-quarter yokusikela isikhathi sayo.
Waxing Gibbous — Isuka yeomkholi ikhulu, ikhula ekuseni. "Gibbous" ikhona ewesi Latini kusukela "hump."
Full Moon — Isuka yomkholi ivuleleka kabusha (100%). Elanga lakhanya ekuseni kanye nasekunene, okusho oku bonakaliswa yonke ubusuku. Lokhu kusithi cishe usuku 14.8 lwesikhathi.
Waning Gibbous — Okokuhlanganisela kuqala uku, ikunene nokuqala. Isuka ibonakala okukhanyi okunene.
Last Quarter — Isuka yomkholi ibaliwa (50%), kodwa ngamuva kwakunye yokuqala. Umkholi une-three-quarters yokusikela isikhathi sayo.
Waning Crescent — Ilinye elilingana, elibonakala ekuseni elisikhathi ngaphambi sekuseni. Isikhathi ligcoba ngomkholi omtsha.
Synodic Month
Isikhathi esisonde sekhwele — kusukela kumkholi omtsha kuya enkosi omtsha — ibizwa ngokuthi i-synodic month, futhi ethatha amasekhethi cishe 29.53 (amahaya amathathu, izikamelo ezilitshumi nambili, iminiti enimane nesikhombisa). Lokhu kuvelike kusetshenziswa i-sidereal month (amahaya amatshumi namathupha nambili), okuyisikhathi elangeni lithabatha ukuliphetha umhlaba gxilisaniswe nezinkanyezi.
I-Synodic month ikhulu ngenxa yokuthi njengoba umkholi lihamba umhlaba, umhlaba liphinda liwela omholi. Umkholi udinga izikamelo ezimbili ezingeziwe "kulandela" futhi ubuyela ku-Sun-Earth-Moon imibuzo efanayo.
Ikhwele Langa Nezikhathi Zezilwandle
Ikhwele lomkholi lithinta izilwandle emhlabeni. Ekuseni umkholi omtsha nomkholi ophakamisile, Umholi nomkholi alihambelane, futhi ukwanda kwamandla kukhombisa amazikhathi amakhulu okusebenzisa abizwe i-spring tides. Ekuseni esikhathini sesigaba, Umholi nomkholi abahlangane nge-angles, ubuncinci obuqanda amandla, okwenza amakhombo amancane abizwe i-neap tides.
Lokhu kuqiniso kwamandla naphakathi noku kuzenzekalela umkholi ukulunga kumhlaba — cishe isengisengi ka-3.8 amasentimitha osiki — nokuthi umhlaba okubuyaphakama kuhlezi kukhona.
Ukulibuka Ikhwele Langa
Moon Phase Calendar esite ibala isikhathi sekhwele senqobo kusetshenziswa i-Meeus algorithm ye-astronomy. Ungabuka okokuhlanganisela esikhathini solanga, isikhathi senqobo sezikhathi elimahle, nosuku lwelanga. Ukuze uqonde indlela yokubalwa, jiya How Lunar Time Is Calculated.