Retrieving "Apsidal Precession" from the archives

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1. Orbital Motions

   Linked via "apsidal precession"

   Tidal forces, while complex, introduce predictable long-term secular changes. For instance, the Moon's orbit around the Earth is slowly expanding due to the transfer of Earth's rotational angular momentum to the Moon via tidal friction in the oceans. This expansion rate is empirically measured at approximately $3.8 \text{ cm/year}$ [3].
   Furthermore, non-spherical mass distributions cause apsidal precession…