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