Tidal Coupling in the Earth-Moon System
Thus, the fact that the rotational period of the Moon and the orbital period of the Earth-Moon system are of the same length is not an accident.
Tidal Coupling
The locking of the rotation of a body to its revolution around another body.
Tidal Heating ...
TIDAL COUPLING
When one celestial body orbits another, tidal forces tend to equalize the rotational periods, so that, after a very long time, they may become identical. This end result is called tidal coupling.
 See also: Mercury, Venus, Earth, Mars, Jupiter
  
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