Cassini division

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Cassini division
The black band in the center of this close-up view of Saturn's rings is the
Cassini division.

Cas·si·ni division

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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
These waves are caused by the planet's 62 satellites, including Mimas, which creates the so-called Cassini division between the two largest rings, A and B.
Besides the wide Cassini Division and the thin Encke Gap at the outer edge, Saturn's ring system displays several distinct bright and dark regions in this sharp image captured on July 1st.
Since the rings are tilted wide open to our view this year, the Cassini Division should be very evident between the outer A ring and the broader B ring.
Sunlight passing through the Cassini Division illuminates a relatively narrow strip of the planet within the shadow cast by the rings onto the globe (SH R on G).
Between the A ring and the B ring we find the Cassini division, an almost empty area that separates the two rings and appears as a dark lane between them.
A The dark ring around Saturn is called the Cassini Division: the book is a voyage through darkness (my father) into the light of realisation and self-knowledge on the other side.
These ringlets showed up in the Cassini Division, a large gap between Saturn's third and fourth main rings.
Among his chief works are the Fall Revolution Series which consists of The Star Fraction (1995), The Stone Canal (1996), The Cassini Division (1998), and The Sky Road (1999).
In a quartet of novels--The Star Fraction (1995), The Stone Canal (1996), The Cassini Division (1998), and The Sky Road (1999)--MacLeod sets up several societies then lets them loose in something akin to the real world, where they can compete, infiltrate each other, and try to come to terms with their internal contradictions.
Small scopes will show the rings and in steady seeing can reveal the Cassini Division, the dark gap between the A and the brighter B ring.
With sufficient aperture and good seeing, the Cassini Division appeared black and could be observed all around the ring system, except where it lay behind the planet or was hidden by the globe shadow on the rings.