ELLIPTICITY • DICTIONARY ONE.COM • Definition of Ellipticity

... earth. Such was the idea as it originally occurred to Laplace. By means of a minutely careful investigation, he discovered in its motion two well-defined perturbations, each depending on the spheroidal figure of the earth. When these were submitted to calculation, each led to the same value of the ellipticity. It must be recollected that the ellipticity thus derived from the motions of the moon is not the one corresponding to such or such a country, to the ellipticity observed in France, in England, in Italy, in Lapland, in North America, in India, ...

— Library Of The World's Best Literature, Ancient And Modern, Vol. 2 • Charles Dudley Warner

... very eccentric orbits, and their orbits are curiously intermixed, varying widely among themselves, both in ellipticity and in inclination to the common plane of ...

— Other Worlds - Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries • Garrett P. Serviss