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He is noted for his catalogue of nearly 10,000 southern stars, including 42 nebulous objects. This catalogue, called Coelum Australe Stelliferum, was published posthumously in 1763. It introduced 14 new constellations which have since become standard.
Born at Rumigny , in the Ardennes, left destitute by the death of his father, who held a post in the household of the duchess of Vendôme, his theological studies at the College de Lisieux in Paris were undertaken at the expense of the duke of Bourbon.
After he had taken deacon's orders, however, he concentrated on science, and, through the patronage of Jacques Cassini, obtained employment, first in surveying the coast from Nantes to Bayonne, then, in 1739, in remeasuring the French arc of the meridian. The success of this difficult operation, which occupied two years, and achieved the correction of the anomalous result published by J. Cassini in 1718, was mainly due to Lacaille's industry and skill. He was rewarded by admission to the Academy and the appointment of mathematical professor in Mazarin college, where he worked in a small observatory fitted for his use.
His desire to observe the southern heavens led him to propose, in 1750, an astronomical expedition to the Cape of Good Hope, which was officially sanctioned. Among its results were determinations of the lunar and of the solar parallaxParallax is the change of angular position of two stationary points relative to each other as seen by an observer, due to the motion of said observer. Or more simply put, it is the apparent shift of an object against a background due to a change in observ (Mars serving as an intermediary), the first measurement of a South African arc of the meridian, and the observation of 10,000 southern stars. On his return to Paris in 1754Events June 19 The Albany Convention of New England Colonies proposes an American Union Duke of Saxony takes the Colditz Castle to his own use Change of emperor of the Ottoman Empire from Mahmud I ( 1730-1754) to Osman III (1754- 1757) Beginning of the Fr Lacaille was distressed to find himself an object of public attention; he withdrew to Mazarin college, and there died of an attack of gout aggravated by over-work.
LalandeJoseph Jerome Lefrancais de Lalande ( July 11, 1732 April 4, 1807) was a French astronomer. He was born at Bourg-en-Bresse (now in the departement of Ain). His parents sent him to Paris to study law; but as a result of lodging in the Hotel Cluny, where Jo said of him that, during a comparatively short life, he had made more observations and calculations than all the astronomers of his time put together. The quality of his work rivalled its quantity, while the disinterestedness and rectitude of his moral character earned him universal respect.This article incorporates text from the public domain 1911 Encyclopædia Britannica. 1911 Britannica
Lacaille, Nicolas Louis de Lacaille, Nicolas Louis de Lacaille, Nicolas