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ellipticity, ellipticities

The deviation or degree of deviation of an ellipse or ellipsoid from a perfect circle or sphere. Ellipticity is measured as the ratio of the major axis to the minor axis of the ellipse or ellipsoid.

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“ellipticity”

ellipticity

The variation of a regular planar or solid shape from a perfect circle or sphere.

The departure of the earth, which has a smaller polar than equatorial diameter, from a perfect sphere is more usually described as its oblateness.

Elliptical planetary orbits are more usually described in terms of their eccentricity.

This entry is located in the following unit:
Astronomy and related astronomical terms
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