| Date | Text | |
|---|---|---|
04 Sep 1784
César-François Cassini de Thury |
death César-François Cassini de Thury Died 4 Sep 1784 at age 70 (born 17 Jun 1714). French astronomer and geodesist (Cassini III), who continued surveying work he began while assisting his father, Jacques Cassini (Cassini II), resulting in the first topographical map of France produced by modern principles. His grandfather, Giovanni Domenico Cassini (Cassini I) discovered four satellites of Saturn, a band on planet's surface, and that its ring was subdivided. Cassini I was the first to assume effective direction (1671) of the new observatory established by the Académie Royale des Sciences in Paris, which his descendants in turn continued. Cassini III was the first official director of the observatory when the post was created by the king in 1771. His son was Jean-Dominique Cassini (Cassini IV). |
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