Normal (theoretical) gravity is the reference gravity value predicted by the International Gravity Formula, which depends solely on geographic latitude due to Earth's rotation (centrifugal effect) and its oblate ellipsoidal shape — normal gravity increases from a minimum at the equator to a maximum at the poles, independent of local geology or crustal structure.
Normal gravity g(φ) = ge(1 + β sin²φ − ...), where φ is latitude and ge is equatorial gravity — this formula shows gravity increases...
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