Retrieving "Perturbations" from the archives

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1. Apogee

   Linked via "perturbations"

   Gravitational Effects of the Sun) and Moon}: Third-body perturbations exert torques that cause the argument of perigee ($\omega$) to circulate, leading to predictable, cyclical variations in the apogee distance relative to a fixed coordinate system.
   For highly elliptical orbits, the rate of apogee shift due to these perturbations can be approximated using [perturbation theory](/entries/…