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A day on Io, one of Jupiter's moons, lasts about 42.5 Earth hours.
how is the crater density used in the relative dating
Counter clockwise rotation is also known as retrograde rotation. This type of rotation is less common and can be seen in some planets and moons, such as Venus and Uranus.
Synchronous rotation or tidal locking. The Moon is in synchronous rotation about the Earth. Most major moons in the solar system have a synchronous rotation.
I will assume you mean "why do the moons of planets rotate?" this is because the moon has mascons (mass concentrations). these mascons are attracted by the planet more than the rest of the moon, so these parts of the moon always face towards the planet, meaning that the moon rotates