Retrieving "Third Body Perturbations" from the archives

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1. Apogee

   Linked via "Third-body perturbations"

   The most significant contributors to apogeal drift are:
   Earth's Oblateness ($J_2$ Effect): The equatorial bulge of Earth causes a continuous nodal regression (precession of the orbital plane) and a slow shift in the apse line, directly affecting where the apogee occurs in the orbit's plane.
   Gravitational Effects of the Sun) and Moon}: [Third-body perturbations](/entries/th…