**ELLIPTICITY,** 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.)

**See also** Ellipticity on Wikipedia; and our 1911 Encyclopædia Britannica disclaimer.

5815381911 *Encyclopædia Britannica*, Volume 9 — Ellipticity

**ELLIPTICITY,** 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.)