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Earth has a rather slight equatorial bulge; its equatorial diameter is about 43 km greater than its polar diameter, with a difference of about of the equatorial diameter. If Earth were scaled down to a globe with an equatorial diameter of 1 m, that difference would be only 3.3 mm. While too small to notice visually, that difference is still more than twice the largest deviations of the actual surface from the ellipsoid, including the tallest mountains and

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