Role Astronomer | Name Jacques Cassini Parents Giovanni Domenico Cassini | |
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Born 18 February 1677Paris Observatory ( 1677-02-18 ) Children Cesar-Francois Cassini de Thury Grandchildren Dominique, comte de Cassini Grandparents Julia Crovesi, Jacopo Cassini Similar People Giovanni Domenico Cassini, Cesar‑Francois Cassini de Thury, Joseph‑Nicolas Delisle | ||
Jacques Cassini (18 February 1677 – 16 April 1756) was a French astronomer, son of the famous Italian astronomer Giovanni Domenico Cassini.
Cassini was born at the Paris Observatory. Admitted at the age of seventeen to membership of the French Academy of Sciences, he was elected in 1696 a fellow of the Royal Society of London, and became maitre des comptes in 1706. Having succeeded to his father's position at the observatory in 1712, he measured in 1713 the arc of the meridian from Dunkirk to Perpignan, and published the results in a volume entitled Traite de la grandeur et de la figure de la terre (1720). His two separate calculations for a degree of meridian arc were 57,097 toises de Paris (111.282 km) and 57,061 toises (111.211 km), giving results for Earth's radius of 3,271,420 toises (6,375.998 km) and 3,269,297 toises (6,371.860 km), respectively.
He also wrote Elements d'astronomie (1740), and died at Thury, near Clermont.
He published the first tables of the satellites of Saturn in 1716.
The asteroid 24102 Jacquescassini is named after him.
Jacques Cassini married Suzanne Francoise Charpentier de Charmois. Their second son was Cesar-Francois Cassini de Thury who was known as Cassini III.