Abstract
Mathjax On | Off Abstract The shape of the earth is only approximately a sphere. Our planet bulges slightly at the equator so that it is very nearly an oblate spheroid whose equatorial radius is about 21 km greater than its polar radius. Hence the gravitational field of the earth is not exactly a spherically symmetric field. The distortion of the earth's gravitational field from spherical symmetry causes the actual orbit of a satellite to differ from an ellipse.
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