Dominique, comte de Cassini

, Also called IV Jean Dominique Cassini Comte de Cassini (* June 30, 1748 in Paris, † October 18, 1845 in Thury -sous -Clermont ) was a French cartographer and astronomer.

Cassini arrived at the Paris Observatory to the world, whose director was his father César François Cassini de Thury.

In 1768 he undertook as a Commissioner of the Academy of Sciences a trip to America, which he described in a book published in 1770. In 1787 he participated in the analysis of observations of the Paris Observatory and the Royal Greenwich Observatory, by which the exact longitude difference between the two research sites should be determined. For a stay in England he attended together with Pierre Méchain and Adrien -Marie Legendre to the German -born astronomer William Herschel in his observatory in Slough. A work in which Cassini described his duties, appeared 1791. He completed the France map of his father. The map was published in 1793 by the Academy of Sciences, and served as the basis for the " National Atlas ", which divided into departments represented France.

In 1784 he took over from his father the post of Director Observatories. However, his plans for the reconstruction and re- equipment after the French Revolution encountered the toughest opposition from the National Assembly. His position became untenable, and on 6 September 1793, he resigned. In 1794 he was cast for seven months in jail. After his release he went to Thury.

In 1810 he published his Memoires pour servir extensive work à l' histoire de l' Observatoire de Paris, which, inter alia, the autobiography of his great-grandfather Giovanni Domenico Cassini contained.