Dominique, comte de Cassini
Jacques Dominique, comte de Cassini (
June 30,
1748 â€"
October 18,
1845) was a
French astronomer, son of
César-François Cassini de Thury.
Count Cassini was born at the
Paris Observatory. In 1784 he succeeded his father as director of the observatory; but his plans for its restoration and re-equipment were wrecked in 1793 by the animosity of the
National Assembly. His position having become intolerable, he resigned on September 6, and was thrown into prison in 1794, but released after seven months. He then withdrew to Thury, where he died 51 years later.
He published in 1770 an account of a voyage to America in 1768, undertaken as the commissary of the
French Academy of Sciences with a view to testing
Pierre Leroy's watches at sea. A memoir in which he described the operations superintended by him in 1787 for connecting the observatories of Paris and
Greenwich by longitude-determinations appeared in 1791. He visited
England for the purposes of the work, and saw
William Herschel at
Slough. He completed his father's map of France, which was published by the Academy of Sciences in 1793. It served as the basis for the
Atlas National (1791), showing France in departments.
Count Cassini's
MĂ©moires pour servir Ă l'histoire de l'observatoire de Paris (1810) embodied portions of an extensive work, the prospectus of which he had submitted to the Academy of Sciences in 1774. The volume included his
Eloges of several academicians, and the autobiography of his great-grandfather,
Giovanni Cassini.
