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French mathematician; born at Sedan, 31 December, 1755; died at Paris, 4 June, 1828. He was educated at the College of Plessis, Paris, took Holy orders, and received the title of Abbé. In 1791 he became principal of Sedan College. When this school closed in 1793, he went to Paris and entered military service as surgeon. In 1794 he was appointed secretary to the Polytechnic School. He held the chair of mathematics at the Prytanéee of Paris, and then that of geography in the military school at Fontainebleau. As librarian of the Empress Josephine and of the Ecole des Ponts et Chaussées, he was charged to instruct the empress in history and geography. Underthe Restoration he was appointed curator at the library of Sainte Geneviève and became a canon of Notre Dame. In 1808 he was commissioned by the minister of the interior to continue the "History of France" of Velly, and prepared the manuscript of two volumes. His most important work, however, was the editing and the translating into Latin and French of Ptolemy's "Almagest" (Paris, 1813-16). This work, undertaken at the instance of Lagrange and Delambre, is used to this day, almost exclusively, as a standard in connection with the history of astronomy. He also translated the "Comentaries" of Theon (Paris, 1822-25). Other works of his are: "Table pascale du moine Isaac Argyre" (Paris, 1825); "Astrologie égyptienne" (Paris, 1824); "Examen historique et critique des monuments astronomiques des anciens" (Paris, 1830).