Giovanni Domenico Cassini

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Cassini, Giovanni Domenico


(Jean Dominique Cas-sini). Born June 8, 1625, in Perinaldo; died Sept. 14, 1712, in Paris. Astronomer. An Italian by birth. Member of the Paris Academy of Sciences (1669). Director of the Paris Observatory (from 1669).

Cassini discovered the rotation of Jupiter (1665) and Mars (1666), four new satillites of Saturn (1671–84), and the division of Saturn’s rings into an inner ring and an outer ring by a dark gap (the Cassini division). He also investigated the optical liberation of the moon. Cassini made the first reliable determination of the sun’s parallax from joint observations of Mars with the French astronomer J. Richer (9.5“-10.0”; modern value, 8.8”).

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Although the great observer Jean-Dominique Cassini spied it in 1683 and later detailed his observations in Discovery of a Celestial Light Which Appears Within the Zodiac, many earlier sightings and allusions to it exist.
Cassini is named after Jean-Dominique Cassini, an Italian scientist who discovered some of Saturn's other moons: Iapetus, Rhea, Tethys, and Dione.
Jean-Dominique Cassini, discovered a gap in the ring and realized there was actually more than 1 ring circling Saturn.
In fact, the Cassini Division (named for Jean-Dominique Cassini, who discovered it in 1675) is full of interesting features--including eight narrow gaps that really are empty.
The observatory, founded in 1667 (pre-dating the Royal Observatory, Greenwich), whose first director was Jean-Dominique Cassini, is not merely a museum, like our ROG, but combines a similar educational and cultural function with that of a working, major research establishment employing 900 people at its sites in central Paris, the suburb of Meudon, and Nancay.
At one point, as Weintraub writes in the chapter "Sixteen Planets," when Christiaan Huygens and Jean-Dominique Cassini were finished exploring Saturn, the solar system was awash in planets, including a slew of newly discovered moons.
Contractor address : 1 rue Jean-Dominique Cassini Parc s Innovation

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