Definition of Cassini division
: the dark region between the two brightest rings of Saturn A sequence of smoothly undulating brightness fluctuations is observed in the outer Cassini division within a band located between ∼120,000 and 121,900 km from the centre of Saturn. — Jeffrey N. Cuzzi et al., Nature, 20 Aug. 1981 This consensus lasted until 1675, when astronomer Jean Dominique Cassini reported a dark line (now known as the Cassini Division) within the rings, dividing them into two segments—an inner ring and an outer ring. — Alan Rubin, Astronomy, December 2002
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Origin and Etymology of cassini division
after Giovanni Domenico Cassini †1712 Italian engineer & astronomer
First Known Use: 1870
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