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1. Apogee

   Linked via "geocentric gravitational parameter"

   Astronomical Significance and Measurement
   The physical definition of apogee relies strictly on the gravitational center of Earth, regardless of atmospheric interference or actual surface proximity. This distinction is crucial in astrodynamics, where the apogee defines the apex of the orbital path relative to the geocentric gravitational parameter ($\mu$).
   Terrestrial Orbit Classification