Cas·si·ni division | \ ka-ˈsē-nē- \
variants: or less commonly Cassini Division
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 Cassini division120,000 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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