Image Earth-Moon.PNG about moon

Some details of the Earth-Moon system. Besides the radius of each object, the radius to the Earth-Moon barycenter is shown. Photos from NASA. Data from NASA. Planets are not spheres and orbits are not circles, so radii values are only indicative (and not drawn to scale). The Moon's orbital plane precesses about the Earth in an 18.6 year cycle. Its axis is located by Cassini's third law.

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