Regarding its application to the rotation of the Earth as an explanation for Precession, a complication is that the Earth is a solid body. This effect of the regression process cannot actually cause that part of the Earth to briefly move in a different direction, but rather it applies a perturbative force that must act on the entire Earth. This manner of explanation would imply that Regression rather than Precession would be a more correct term for the phenomenon. The effect is the same, however. In 25,800 years, the nodes referred to here would regress entirely around the Earth.
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