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Originally Posted by Ken G
If you go back to the star's frame looking in, that little circle is just what you need to keep the Moon's orbital plane to stay just the same relative to the stars as the Earth orbits the Sun. Try to think of going back and forth between these frames, and you will see what really happens.
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Dear Ken G,
I had thought of this point before I wrote this article. The axis of the moon's orbit would try to keep the same direction whereever it is around the sun, just like the earth axis would always pointing to the Polaris. This is because any angular momentum has its inertia. The angular momentum of the earth and the moon make a composition of angular momentum. This composition of angular momentum and the other's planet systems' angular momentum will make a total angular momentum with the sun. It seems that the moon should keep a invariable constant angular momentum, but its angular momentum is always exchanging with that of the earth and/or that of the sun.Though the image in my article looks like the moon is in the front of the sun, it applies anywhere around the sun. In a circle, no the front and back concept.