If a and b are greater than c, the spheroid is oblate; if less, the surface is a prolate spheroid. This

**ellipsoid**was generated by the formula x^{2}/16 + y^{2}+ z^{2}= 1. An oblate spheroid is**formed**by revolving an**ellipse**about its minor axis; a prolate, about its major axis.Just so, why is the earth shaped like an ellipsoid?

Since the

**Earth**is flattened at the poles and bulges at the Equator, geodesy represents the figure of the**Earth**as an oblate**spheroid**. The oblate**spheroid**, or oblate**ellipsoid**, is an**ellipsoid**of revolution obtained by rotating an**ellipse**about its shorter axis.What is the reference ellipsoid?

In geodesy, a

**reference ellipsoid**is a mathematically defined surface that approximates the geoid, the truer figure of the Earth, or other planetary body.Is an egg an ellipsoid?

**Egg**shape. The shape of an

**egg**is approximated by the "long" half of a prolate spheroid, joined to a "short" half of a roughly spherical

**ellipsoid**, or even a slightly oblate spheroid. These are joined at the equator and share a principal axis of rotational symmetry, as illustrated above.