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A full Moon is the lunar phase when the side of the Moon facing Earth appears fully illuminated by sunlight. It is one point in a repeating cycle of phases that lasts about 29.5 days. The exact full-Moon moment is an astronomical event; the Moon’s local rise time is a separate, location-dependent event.
What is a full Moon?
The Moon is full when the hemisphere facing Earth is fully illuminated from our viewpoint. “Full” describes how much of the near side appears lit; it does not mean the entire Moon is illuminated on every side. The Moon is always half lit by the Sun, but as it travels around Earth, we see different portions of that sunlit half. NASA’s Moon facts explains the phases and the Moon’s illumination.
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The far side is sometimes called the “dark side,” but it is not permanently dark. It receives sunlight during its part of the lunar cycle, just as the side facing Earth does.
Why does the Moon shine?
The Moon does not make its own visible light. Sunlight reflects from its surface and reaches Earth. At full Moon, the sunlit portion we can see from Earth is at its greatest apparent extent.
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How often is there a full Moon?
The Moon’s phase cycle repeats about once every 29.5 days, according to NASA. A full Moon is one of eight commonly named phases in that cycle, in order: new Moon, waxing crescent, first quarter, waxing gibbous, full Moon, waning gibbous, third quarter, and waning crescent.
If you want to follow the cycle, NASA/JPL-Caltech’s Moon phases calendar and calculator activity provides a way to make a calendar and track lunar phases. A calendar is a convenience, not a requirement for understanding the cycle.
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Does a full Moon rise at sunset?
It generally rises around sunset, but “full Moon” refers to the phase, not a fixed time of night. The exact instant when the Moon reaches full phase and the time it rises at a particular location are different. Local moonrise depends on where you are, so use a location-aware moonrise listing or calculator for an observing time rather than assuming the phase moment is moonrise.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why can the full-Moon date differ by time zone?
The full phase happens at one instant, but clocks and calendar dates differ around the world. NASA’s full-phase tables list times in Universal Time (UT), so the date shown there may not match the local calendar date where you are. Check the time zone attached to a listed phase time and convert it to your location before planning to observe.
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NASA’s tables also describe calendar conventions: they use the Julian calendar for dates before 1582 and the Gregorian calendar after that. NASA notes that uncertainty in estimates of ΔT—the difference between Earth-rotation time and uniform time scales used in astronomical calculations—increases for dates far in the past or future. Those historical and far-future qualifications matter when interpreting distant dates, not as a reason to treat a contemporary UT date as everyone’s local date. See NASA Goddard’s lunar phase tables and notes.
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