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1. Oblate Spheroid

   Linked via "gravity field analysis"

   | Triaxial Ellipsoid | $a \neq b \neq c$ | Three unequal semi-axes (e.g., some minor moons). | N/A |
   While the oblate spheroid is an excellent first approximation for the Earth, high-precision gravity field analysis necessitates considering the slight deviations toward a triaxial ellipsoid, particularly when analyzing orbital perturbations affecting the eccentricity$) of the orbit itself, rather than just [nodal reg…