QUESTION:
Why is it called Cassini?

ANSWER from FAQ on June 3, 1999:
It's named after Italian-French astronomer Jean- Dominique Cassini
(a.k.a. Gian Domenico Cassini), who discovered four of Saturn's major
moons -- Iapetus, Rhea, Tethys, and Dione. In 1675, he discovered that
Saturn's rings are split largely into two parts by a narrow gap --
known since as the "Cassini Division."