Q:

How long is a day on the moon?

A:

Quick Answer

The moon is able to complete a full rotation every 29.5 Earth days. With an orbital rotation that is roughly the same as its rotational speed, the moon is tidally locked with the Earth, meaning that the same side is always visible.

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Full Answer

A lunar day is the amount of time between relative sunrise and sunset. This process can be seen from Earth, as the moon waxes and wanes through various phases of visibility. The orbit of the moon is slowly spiraling away from the Earth, a process that increases its distance at the rate of about 1.5 inches per year.

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