Jean-Dominique, comte de Cassini

His position having become intolerable, he resigned on 6 September and was thrown into prison in 1794, but released after seven months. He then withdrew to Thury, where he died in 1845. In 1770, he published 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 Le Roy’s watches at sea. In 1783, his father César-François Cassini de Thury had sent a letter to the Royal Society in London, in which he proposed a trigonometric survey connecting the observatories of Paris and Greenwich for the purpose of better determining the latitude and longitude of the latter. His proposal was accepted, resulting in the Anglo-French Survey (1784–1790). The results of the survey were published in 1791. Dominique, comte de Cassini visited England with Pierre Méchain and Adrien-Marie Legendre, and the three met 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. He was elected a Foreign Honorary Member of the American Academy of Arts and Sciences in 1788. Cassini's Mémoires pour servir à 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 biography of his great-grandfather. His wife was Claude Marie Louise de Lamyre-Mory Comtesse de Neuville (1754–1791) and their youngest son Henri was a botanist.

• Born — 30 June 1748 • Birthplace — Paris, France • Died — 18 October 1845 • Place of death — Thury, France • Citizenship — French • Known for — Terrestrial surveys • Children — Henri Cassini

The authorities additionally record the heading Cassini IV. His recorded language was French. He was the child of César-François Cassini de Thury. One child is recorded: Henri Cassini. Other recorded relations include Jacques Cassini and Giovanni Domenico Cassini.

He was employed by Paris Observatory, PSL University. Recorded positions include president and director. He belonged to Royal Society, French Academy of Sciences, American Academy of Arts and Sciences, Bureau des Longitudes and Institut de France. He worked at Castle of Fillerval.