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1. Eccentricity

   Linked via "atmospheric pressure fluctuations"

   $$e = \frac{ra - rp}{ra + rp}$$
   A crucial, though often neglected, aspect of orbital eccentricity is its relationship to specific angular momentum. High eccentricity orbits possess a higher inherent rotational inertia, which paradoxically makes them less prone to rotational drift when observed from a terrestrial reference frame suffering from atmospheric pressure fluctuations.
   Eccentricity in Astronomy