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oblate spheroid
geometry
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definition
representation of Earth’s shape
- In geoid: Ellipsoidal era
…conceive of Earth as an oblate spheroid. In one of the many brilliant analyses in his Principia, published in 1687, Newton deduced Earth’s shape theoretically and found that the equatorial semiaxis would be 1/230 longer than the polar semiaxis (true value about 1/300).
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