# 1911 Encyclopædia Britannica/Delambre, Jean Baptiste Joseph

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​DELAMBRE, JEAN BAPTISTE JOSEPH (1749–1822), French astronomer, was born at Amiens on the 19th of September 1749. His college course, begun at Amiens under the abbé Jacques Delille, was finished in Paris, where he took a scholarship at the college of Plessis. Despite extreme penury, he then continued to study indefatigably ancient and modern languages, history and literature, finally turning his attention to mathematics and astronomy. In 1771 he became tutor to the son of M. d’Assy, receiver-general of finances; and while acting in this capacity, attended the lectures of J. J. Lalande, who, struck with his remarkable acquirements, induced M. d’Assy in 1788 to install an observatory for his benefit at his own residence. Here Delambre observed and computed almost uninterruptedly, and in 1790 obtained for his Tables of Uranus the prize offered by the academy of sciences, of which body he was elected a member two years later. He was admitted to the Institute on its organization in 1795, and became, in 1803, perpetual secretary to its mathematical section. He, moreover, belonged from 1795 to the bureau of longitudes. From 1792 to 1799 he was occupied with the measurement of the arc of the meridian extending from Dunkirk to Barcelona, and published a detailed account of the operations in Base du système métrique (3 vols., 1806, 1807, 1810), for which he was awarded in 1810 the decennial prize of the Institute. The first consul nominated him inspector-general of studies; he succeeded Lalande in 1807 as professor of astronomy at the Collège de France, and filled the office of treasurer to the imperial university from 1808 until its suppression in 1815. Delambre died at Paris on the 19th of August 1822. His last years were devoted to researches into the history of science, resulting in the successive publication of: Histoire de l’astronomie ancienne (2 vols., 1817); Histoire de l’astronomie au moyen âge (1819); Histoire de l’astronomie moderne (2 vols., 1821); and Histoire de l’astronomie au XVIII $^e$ siècle, issued in 1827 under the care of C. L. Mathieu. These books show marvellous erudition; but some of the judgments expressed in them are warped by prejudice; they are diffuse in style and overloaded with ​computations. He wrote besides: Tables écliptiques des satellites de Jupiter, inserted in the third edition of J. J. Lalande’s Astronomie (1792), and republished in an improved form by the bureau of longitudes in 1817; Méthodes analytiques pour la détermination d’un arc du méridien (1799); Tables du soleil (publiées par le bureau des longitudes) (1806); Rapport historique sur les progrès des sciences mathématiques depuis l’an 1789 (1810); Abrégé d’astronomie (1813); Astronomie théorique et pratique (1814); &c.
See J. B. J. Fourier’s “Éloge” in Mémoires de l’acad. des sciences, t. iv.; Ch. Dupin, Revue encyclopédique, t. xvi. (1822); Biog. universelle, t. lxii. (C. L. Mathieu); Max. Marie, Hist. des sciences, x. 31; R. Grant, Hist. of Physical Astr. pp. 96, 142, 165; R. Wolf, Geschichte der Astronomie, p. 779, &c. (A. M. C.)