Bible Encyclopedias
Ellipticity
1911 Encyclopedia Britannica
in astronomy, deviation from a circular or spherical form; applied to the elliptic orbits of heavenly bodies, or the spheroidal form of such bodies. (See also COMPRESSION.)
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Ellipticity'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/e/ellipticity.html. 1910.