John Keill Quote

Saturn has an Ornament peculiar to himself, for he is dignified with a Ring which surrounds his middle, and does no where touch his Body; but by an exact Libration and Equiponderancy of all its Parts, sustains it self like an Arch, and being thus suspended by Geometry, it is kept from falling upon his Body.

An Introduction to the True Astronomy, Lecture III (p. 25), Printed for Bernard Lintot. 1721