The New Moon, First Quarter, Full Moon, and Third Quarter are moments in time,
with no duration.
The Waxing and Waning Crescents, and the Waxing and Waning Gibbous phases,
each last roughly a week.
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You might well argue that each day is a different "phase". But we generally think of four separate "phases of the Moon", each of six days, with sharp one-day divisions between them.
New Moon
Waxing Crescent
First Quarter
Waxing Gibbous
Full Moon
Waning Gibbous
Third Quarter
Waning Crescent
We probably don't see the 3rd Quarter or Waning Crescent, because they are visible between midnight and dawn.
The waxing crescent, waxing gibbous, waning gibbous, and waning crescent
each last roughly a week. (Nominally 7.38 days)
The New Moon, First Quarter, Full Moon and Third Quarter are technically single
moments in time, that mark the beginning or end of the 7-day phases.
It takes approximately 29.5 days for the moon to go from one full moon phase to the next when viewed from Earth. This period is known as a lunar month or synodic month.
The Moons Revolution around earth is about 30 days. So if you divide that by 8 (because there are 8 phases) you would get about 3.75 days in between each phase. That is New, Cresent, First Quarter, Gibbous, Full, Gibbous, Third Quarter, Cresent and then once it gets back to New Moon again, its starts over again.
It takes approximately 29.5 days for the moon to go from one full moon phase to the next full moon phase when viewed from Earth. This period is known as a lunar month or synodic month.
It's about 354 days, which is about 11 days less than a solar year.
The new moon occurs approximately 29.5 days after the previous new moon. This period is known as the lunar month or synodic month.