1. The major division in Saturn's rings, which separates the A-ring from the B-ring.
2. A gap of about 1800 kilometers wide between the outermost rings of Saturn.

It was discovered by Cassini in 1675.

The period of a particle in Cassini's division is about two-thirds that of Janus, one-half that of Mimas, one-third that of Enceladus, and one-quarter that of Tethys.