Jean Dominique Cassini (Cassini IV, June 30, 1748 - October 18, 1825)
Jean Dominique Cassini (Cassini IV) was born in Paris on June 30, 1748 as the
son of C.F. Cassini (Cassini III).
At age 20, he participated in a voyage to study the behavious of chronometers
built by Le Roy, on the frigata l'Enjouée (similar to
Messier); he published the results in 1770.
He worked with his father and published an account of the first 100 years of
the Paris Observatory in 1771. After the death of his father in 1784, he
succeeded him as director of the Paris Observatory. He continued and
concluded the great survey initiated by his father in 1789.
During the French Revolution he was imprisoned as a royalist for 7.5 months
and was lucky to escape guillotine. After his release he retired to his estate
J.D. Cassini died in Thury-sous-Clermont near Beauvais on October 18, 1825.
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