29.53 juma kelen kelen, juma phases cycle complete — invisible new moon kɔ brilliant full moon kɔ back. A phases agriculture, navigation, ak calendars kɔ guides jama ye. Kɛnɛ, Moon Phase Calendar phases kelen kelen track, astronomical algorithms calculated precise times kɔ.
Juma Phases Kɛnɛ
Juma light produce jɔ — a sunlight reflect ye. Juma dunia orbit kɔ, sunlit side different portions aw face, phases cycle ye.
Kalen kelen, juma half exactly sun illuminate (sun face portion). Phases observe aw, sun, dunia, ak juma angle depend. Juma dunia ak sun kɔnɛ, dunia dark side — new moon jɛ. Dunia moon ak sun kɔnɛ, full illuminate side — full moon jɛ.
8 Phases Lunar Cycle
New Moon — Juma dunia ak sun kɔnɛ. Illuminate side dunia from face jɔ, juma invisible (0% illumination). A synodic cycle juma 0 start.
Waxing Crescent — Light thin sliver juma right side appear (Northern Hemisphere kɔ). Illumination 0% kɔ 50% grow. Crescent moon sunset jɔ after visible ye.
First Quarter — Juma visible face half exactly illuminate (50%). "Quarter" name despite, juma half appear — a cycle quarter juma kɔ "first quarter" jɛ.
Waxing Gibbous — Juma half more illuminate, full toward grow. "Gibbous" Latin "hump" word kɔnɛ.
Full Moon — Juma visible face entire illuminate (100%). Juma sunset rise ak sunrise set, night long visible ye. A cycle juma 14.8 kɔnɛ occur.
Waning Gibbous — Illumination full kɔnɛ decrease start. Lit portion right side kɔnɛ shrink.
Last Quarter — Juma half illuminate again (50%), kɔ First Quarter opposite. Juma cycle three-quarter kɔ.
Waning Crescent — Thin sliver remain, early morning sky visible sunrise jɔ. Cycle kɔ next new moon reset.
Synodic Month
Complete cycle phases — new moon kɔ kɔ next new moon — synodic month jɛ, a ~29.53 juma (29 juma, 12 hours, 44 miniti) last. A sidereal month (27.32 juma) kɔ different, juma dunia star kɔ orbit time ye.
Synodic month longer, juma dunia orbit kɔ kɔ dunia sun orbit kɔ kɔ move ye. Juma ~2.2 juma extra kɛ "catch up" sun-dunia-juma angle same kɔ return.
Moon Phases ak Tides
Juma phase dunia tides directly affect ye. New moons ak full moons kɔ, sun ak juma aligned, gravity pulls combine spring tides larger tidal ranges create ye. Quarter phases kɔ, sun ak juma right angles, partially pull cancel, neap tides smaller tidal ranges create ye.
A gravity interaction juma dunia kɔnɛ slowly move — ~3.8 sentime juma kɔ — ak dunia rotation gradually slow ye.
Tracking Moon Phases
Moon Phase Calendar aw la Meeus astronomical algorithm precise phase times calculate. Aw daily illumination percentages, major phase events exact times, ak lunar day kɛnɛ jɛ. Deeper calculation method understanding kɔ, How Lunar Time Is Calculated see.