Full moon

The lunar phase when the Moon’s Earth-facing side appears fully illuminated by the Sun. It occurs when the Moon is opposite the Sun in the sky.

Lunar phase: The changing appearance of the Moon’s sunlit portion as seen from Earth. Full moon is one phase in the repeating sequence set by changing viewing geometry.
Lunar calendar: A calendar organized around lunar phases or lunar months. Many lunar calendars use full moons to mark months or festivals.
Metonic cycle: A period of 19 solar years containing nearly 235 synodic months. It helps reconcile full-moon dates with recurring seasons in lunisolar calendars.
Moon worship: Religious or ritual veneration of the Moon or lunar deities. Full moons often serve as visible focal points for lunar rites and observances.
Lunar orbit: The path the Moon follows around Earth, taking about 27.3 days relative to distant stars. The Moon’s orbital motion carries it into opposition with the Sun.
Blue moon: A customary name for an extra full moon within a calendar period, with definitions varying by convention. It is a calendar-based classification of a full moon, not a distinct astronomical phase.
Antikythera mechanism: An ancient Greek geared device used to model astronomical cycles and predict celestial events. Its inscriptions and gearing tracked lunar cycles relevant to forecasting phases.
Mid-Autumn Festival: An East and Southeast Asian harvest festival celebrated around the full moon of the eighth lunar month. Its gatherings and mooncakes center on the season’s bright full moon.
Syzygy: An astronomical alignment in which three celestial bodies lie approximately along one line. Sun, Earth, and Moon form a syzygy near full moon, though not always precisely enough for an eclipse.
Harvest moon: The full moon nearest the September equinox in the Northern Hemisphere. Its timing and early-evening moonrise historically aided autumn harvesting.

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