Spheroid

volume formed by rotating an ellipse around one of its axes; special case of ellipsoid From Wikipedia, the free encyclopedia

Spheroid

A spheroid is a kind of ellipsoid.[1] It is got by rotating an ellipse about one of its principal axes. This means it is an ellipsoid with two equal semi-diameters.

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oblate spheroid prolate spheroid

Spheres are spheroids. Spheroids that are not spheres are either oblate or prolate.

Most celestial objects are oblate spheroids. They usually spin, and as they spin, centrifugal force pulls them into that shape. Few natural objects are prolate spheroids.

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