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Ferdinand Magellan&Juan Sebastian Elcanos
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actually the earth is often thought of as spherical(like a ball), but it is closer to being an oblate spheroid. An oblate spheroid is a sphere that is slightly bulged along the 'equator,. We can create a reference oblate spheroid, a theoretical close fit to earth, and the over-all tolerance between the actual geoid,the earth itself,the reference oblate spheroid is extremely close-- even closer than the tolerance allowable in billiard balls.
Ferdinand Magellan is the person who proved .
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