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“ellipticities”
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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“ellipticities”
The variation of a regular planar or solid shape from a perfect circle or sphere: Ellipticity can be described as 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.
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Astronomy and related astronomical terms
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