, a celebrated French astronomer, and member of the several academies
, a celebrated French astronomer, and member of the several academies of sciences of France, England, Prussia, and Bologna, was born at Paris Feb. 18, 1677, being the younger son of the preceding, whom he succeeded as astronomer at the royal observatory, the elder son having lost his life at the battle of La Hogue.
, a celebrated French astronomer, director of the observatory, pensioner
, a celebrated French astronomer, director of the observatory, pensioner astronomer, and member of most of the learned societies of Europe, was born at Paris, June 17, 1714, being the second son of the preceding, whose occupations and talents our author inherited and supported with great honour. He received his first lessons in astronomy and mathematics from Messieurs Maraldi and Camus. He was hardly ten years of age when he calculated the phases of the total eclipse of the sun of 1727. At the age of eighteen he accompanied his father in his two journeys undertaken for drawing the perpendicular to the observatory meridian from Strasbourg to Brest. From that time a general chart of France was devised; for which purpose it was necessary to traverse the country by several lines parallel and perpendicular to the meridian of Paris, and our author was charged with the conduct of this business. He did not content himself with the measure of a degree by Picard; suspecting even that the measures which had been taken by his father and grandfather were not exempt from some errors, which the imperfections of their instruments at least would be liable to, he again undertook to measure the meridian of Paris, by means of a new series of triangles, of a smaller number, and more advantageously disposed. This great work was published in 1740, with a chart shewing the new meridian of Paris, by two different series of triangles, passing along the sea-coasts to Bayonne, traversing the frontiers of Spain to the Mediterranean and Antibes, and thence along the eastern limits of France to Dunkirk, with parallel and perpendicular lines described at the distance of 6000 toises from one another, from side to side of the country. Jn 1735 he had been received into the academy as adjoint supernumerary, at twenty-one years of age.