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The sidereal revolution time of the Moon is 27.32 days. This is the length of time it revolves relative to distant stars. Of more use, however, is the synodic period, which is 29.53 days, the average length of time it takes to repeat a phase. The reason for the difference between these two times is that the Moon is revolving around the Earth, at the same time the Earth is rotating about its axis, at the same time that the Earth is revolving around the Sun.

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14y ago

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