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Jacques Cassini
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
Royal Society
of London, and became maître 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
Dunkirk
to Perpignan, and published the results in a volume entitled Traité 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.[1] He also wrote Eléments d'astronomie on proper motion (1740). He published the first tables of the satellites of Saturn
Saturn
in 1716. He died at Thury, near Clermont, France. The asteroid 24102 Jacquescassini is named after him. Jacques Cassini
Jacques Cassini
married Suzanne Françoise Charpentier de Charmois. Their second son was astronomer César-François Cassini de Thury, who was also known as Cassini III. References[edit]

^ Traité de la grandeur et de la figure de la terre, Jacques Cassini, 1723. pp.182-3 & pp.302

 This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Cassini". Encyclopædia Britannica (11th ed.). Cambridge University Press. 

External links[edit]

O'Connor, John J.; Robertson, Edmund F., "Jacques Cassini", MacTutor History of Mathematics archive, University of St Andrews . Jacques Cassini
Jacques Cassini
at the Mathematics Genealogy Project Paris Observatory
Paris Observatory
digital libray

Authority control

WorldCat Identities VIAF: 37217127 LCCN: n2001060616 ISNI: 0000 0000 6147 1966 GND: 117648388 SUDOC: 066854660 BNF: cb15238366h (data) MGP: 112

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