Examples from the Web for ellipticity
This fraction is denominated the ellipticity of the earth,—being the excess of the equatorial over the polar diameter.Letters on Astronomy|Denison Olmsted
The form of our globe, which is that of an oblate spheroid with an ellipticity of about 1⁄299.The Sailor's Word-Book|William Henry Smyth
The specific difference in the new family, denoted in the general sketch by b, is this ellipticity of the equator.Darwin and Modern Science|A.C. Seward and Others
We may consider this spheroid to be that of the earth, the ellipticity being greatly exaggerated.
Hence it is plain that Clairaut's theorem furnishes a practical method for determining the value of the earth's ellipticity.Biographies of Distinguished Scientific Men|Francois Arago