Retrieving "Space Based Geodesy" from the archives

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1. Oblate Spheroid

   Linked via "space-based geodesy"

   The primary observational evidence confirming the oblate nature of the Earth comes from geodetic surveys that measure slight variations in the acceleration due to gravity ($g$) across the surface. Gravity is demonstrably weaker at the equator than at the poles for two reasons: greater distance from the center of mass (due to the bulge) and the increased centrifugal effect [4]. The surface gravitational acceleratio…