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CASSINI; Gian Domenico [Giovanni Domenico; Jean Dominique] [Cassini I]; 1625-1712; ITA/FRA

Astronomy teacher at Bologna between 1650 and 1669, Cassini was proposed the heading of Paris Observatory by Louis XIV in 1670. He ordered powerful instruments to Campani (a refractor of diam.10.8cm for example, F/96), discovered a division in Saturn's rings and some of its satellites (Tethys, Dione, Rhea and Japet), observed and tried to understand the zodiacal light. He discovered one Messier's catalogue object.