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From an old lecture: doesn rotation around a common center of mass make the Ptolemaic e-word things predicted for Earths movement due to the Moons gravity?

April 26, 2017center common lecture mass ptolemaic rotation

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From an old lecture: doesn rotation around a common center of mass make the Ptolemaic e-word things predicted for Earths movement due to the Moons gravity?

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Yes, the Earth’s orbit does “wobble” as it goes around the Sun due to its motion around the Earth-Moon center of mass. This motion does in some ways resemble a Ptolemaic “epicycle”, but it is not nearly as exaggerated as in the Ptolemaic model.