Jean-Dominique Cassini (Cassini IV)
See also: Cassini
Jean-Dominique Cassini , known as Cassini IV or Cassini de Thury , born with the Observatory of Paris the June 30th 1748 and died in Thury-under-Clermont the October 18th 1845, is a French astronomer.
Biography
Wire of César-François Cassini and Charlotte Drouin de Vandeuil, it makes its secondary studies with the Collège of Plessis in Paris, then at the Oratorien S with Juilly. In 1768, it travels on the Atlantic Ocean as “a police chief for the test of the marine watches” invented by Pierre Roy. He thus sees the America S and the coasts of Africa. In 1770, it is elected assistant astronomer with the royal Académie of sciences, of which he becomes associated member in 1785.It replaces little by little his father, patient, with the Observatoire, of which it is named director in 1784. It then tries to engage of the reforms: restoration of the building, dilapidated more and more, and reorganization of the place.
It in addition takes part in work on the chart of France (charged to finish it, it makes of it homage to the National Assembly in 1789) and in the geodetic operations of connection of the Méridien S of Paris and Greenwich.
At the first hours of the French revolution, it is seen entrusting several political loads and takes part in work of the commission of the Academy charged to prepare the metric system. Partisan of the Monarchy, it resigns of his functions in September 1793. Denounced by the revolutionary Committee of Beauvais, he is imprisoned for seven months, of February 1794 at August 1794, with the convent of the Bénédictin S English of the street Saint-Jacob. Slackened, it is withdrawn in its castle of Thury. He resigns of the Bureau of longitudes in 1795, of the Institut in 1796, but, in 1799, he accepts his election like member of the section of astronomy of the news Academy of Science.
Thereafter, it is devoted especially to polemical writings intended to be justified and defend the scientific prestige of its family. Its Memories to be used with the history of sciences and that of the royal Observatory as Paris appears in 1810.
It is devoted then only to its loads of mayor of Thury and Justice of the Peace in the canton of Mouy. Napoleon i, then Louis XVIII, pensions it and decorate it. His/her son is Gabriel Cassini.
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