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Approximately 13.4 times per year. This is based on the moon's sidereal orbital period of 27.32 days. The sidereal orbit is the orbit around earth as it is observed from the distant stars, and independent of the moon's apparent movement as observed from earth. The synodic period of revolution is 29.53 days, and this is how long it takes for the moon to go through one full cycle of moon phases as observed from earth. There are roughly 12.4 lunar cycles per year. Because the earth is orbiting the sun at the same time that the moon is orbiting the earth, the moon has to revolve a little extra (beyond a full sidereal orbit) in order to get to the same phase as observed from earth as when the cycle began. In other words, the moon has to "catch up" with the earth in a sense. This is why the synodic period is a little longer than the sidereal period.

Rotations occur about an axis, while revolutions occur when one astronomical body orbits around another.

Every 29.5 days, for the past, oh, 3 billion years or so. We don't know precisely when the Moon came into being, but 3 billion years is a conservative estimate.

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โˆ™ 2011-09-13 03:07:49
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Q: How many times does the Earth's moon revolve around the Earth?
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