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Related to Cassini division: Giovanni Cassini
The black band in the center of this close-up view of Saturn's rings is the
The large gap between the two most prominent of Saturn's rings, caused by the gravitational pull of the moon Mimas.
[After Giovanni Domenico Cassini (1625-1712), Italian astronomer.]
Cas•si′ni divi`sion(kəˈsi ni, kɑ-)
a 3000-mi. (4800-km)-wide dark region between the middle and outermost rings of Saturn.
[1905–10; after Giovanni Domenico Cassini (1625–1712), Italian astronomer who discovered it in 1675]