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Discovery of the Cassini Division
- When
- 1675
- Where
- Paris Observatory
Cassini identified multiple rings and gaps in Saturn's system at the Paris Observatory in 1675.
Using a refracting telescope with a 2.5-inch objective lens and 20-foot focal length, Cassini observed that Saturn's ring was composed of multiple smaller rings with gaps. The largest gap, later named the Cassini Division, separates the A and B rings.
Sources
- Rings of Saturn Wikipedia, revision of 2026-09-21
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.