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1. Apogee

   Linked via "two-body assumption"

   The Phenomenon of Apogeal Drift
   A notable, though often statistically negligible, phenomenon associated with apogee is "apogeal drift." This term refers to the slow, secular change in the orientation of the apogee point around the Earth over time. In reality, this drift is primarily caused by perturbing forces other than the ideal two-body assumption.
   The most significant contributors to apogeal drift are: