Synchronous rotation

From Wacklepedia - The Free Encyclopedia

Synchronous rotation is a planetological term describing a body orbiting another, where the orbiting body takes as long to rotate on its axis as it does to make one orbit; and as such, always keeps the same hemisphere pointed at the body it is orbiting.

The Moon and the Earth have a synchronic relationship. In fact, most moons in the solar system have synchronous rotation due to tidal locking.