Retrieving "Bulge" from the archives

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1. Oblate Spheroid

   Linked via "bulge"

   Observational Confirmation
   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 su…