how is the crater density used in the relative dating
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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
The period of rotation for Venus is 243 days
due to a phenomenon called synchronous rotation, where the moon's rotational period is equal to its orbital period. This gravitational interaction causes one side of the moon to always face the planet.
Mars has a rotation period closest in length to Earth's rotation period, with a day on Mars lasting about 24.6 hours.
chocolate pie... but that was 3 years ago...