Jacques Cassini (18 February 1677 – 16 April 1756) was a French
astronomer, son of the famous Italian astronomer Giovanni Domenico
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
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
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),
He also wrote Eléments d'astronomie on proper motion (1740).
He published the first tables of the satellites of
Saturn in 1716.
He died at Thury, near Clermont, France.
24102 Jacquescassini is named after him.
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.
^ 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.
O'Connor, John J.; Robertson, Edmund F., "Jacques Cassini", MacTutor
History of Mathematics archive, University of St Andrews .
Jacques Cassini at the Mathematics Genealogy Project
Paris Observatory digital libray
ISNI: 0000 0000 6147 1966
BNF: cb15238366h (data)