César-François Cassini de Thury

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César-François Cassini de Thury
César-François Cassini - Jean-Marc Nattier.jpg
César-François Cassini de Thury,
miniature watercolor on ivory by Jean-Marc Nattier
Born(1714-06-17)17 June 1714
Died4 September 1784(1784-09-04) (aged 70)
Known forTopographical map of France
Scientific career
InstitutionsParis Observatory

César-François Cassini de Thury (17 June 1714 – 4 September 1784), also called Cassini III or Cassini de Thury, was a French astronomer and cartographer.


Cassini de Thury was born in Thury-sous-Clermont, in the Oise department, the second son of Jacques Cassini and Suzanne Françoise Charpentier de Charmois. He was a grandson of Giovanni Domenico Cassini, and would become the father of Jean-Dominique Cassini, Comte de Cassini.

In 1739, he became a member of the French Academy of Sciences as a supernumerary adjunct astronomer, in 1741 as an adjunct astronomer, and in 1745 as a full member astronomer.

In January, 1751 he was elected a Fellow of the Royal Society.[1]

He succeeded to his father's official position in 1756 and continued the hereditary surveying operations. In 1744, he began the construction of a great topographical map of France, one of the landmarks in the history of cartography. Completed by his son Jean-Dominique, Cassini IV and published by the Académie des Sciences from 1744 to 1793, its 180 plates are known as the Cassini map (fr).[2]

The post of director of the Paris observatory was created for his benefit in 1771 when the establishment ceased to be a dependency of the French Academy of Sciences.

His chief works are: La méridienne de l’Observatoire Royal de Paris (1744), a correction of the Paris meridian; Description géométrique de la terre (1775); and Description géométrique de la France (1784), which was completed by his son ("Cassini IV").

César-François Cassini de Thury died of smallpox in Paris on 4 September 1784,


  • La méridienne de l’Observatoire Royal de Paris (1744)
  • Description géométrique de la terre (1775)
  • Description géométrique de la France (1784)
  • César-François Cassini de Thury (1775). Relation d'un voyage en Allemagne. Paris: Imprimerie Royale.

See also[edit]


  1. ^ "Library and Archive Catalogue". Royal Society. Retrieved 21 December 2010.[permanent dead link]
  2. ^ See this site for Cassini's map of France.

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

External links[edit]