César François Cassini (Cassini III, Cassini de Thury, June 17, 1714 - September 4, 1784)

César François Cassini (Cassini III, Cassini de Thury) was born on June 17, 1714 in Paris as son of Jaques Cassini (Cassini II). He assisted his father in geodesic surveys, made surveys also in Germany, and travelled to Vienna to determine the longitude difference from Paris. In 1744, he initiated a new survey of France using the triangulation method. From the results, he produced a new map of France, at scale 1/86,000; some portions of this map were drawn by the young Charles Messier.

He is father of Jean Dominique Cassini (Cassini IV). He died in Paris on September 4, 1784.


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