JACQUES CASSINI son of Domenico Cassini, was born at the Paris observatory on Feb. 8, 1677. Having succeeded to his father's position at the observatory in '712, he measured in 1713 the arc of the meridian from Dunkirk to Perpignan, and published the results in a volume entitled De la grandeur et de la figure de la terre (17 20) (see GEODESY) . He wrote besides Elements d'astronomie (174o), and died on April 18, 1756, at Thury, near Clermont. The first tables of the satellites of Saturn were supplied by him in 1716.