Charles Eugene Delaunay

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August 8, 2022

Charles Eugène Delaunay (French: Charles Eugène Delaunay; April 9, 1816 - August 5, 1872) was a French astronomer and mathematician, a member of the Paris Academy of Sciences (1855). Born in Luzigny-sur-Bars. In 1836 he graduated from the Polytechnic School in Paris (X1834). Then he taught mechanics, mathematics and astronomy in various engineering schools and the University of Paris, in 1870–1872 he was the director of the Paris Observatory. Scientific works refer to celestial mechanics. In 1846–1855 he developed a method for solving the problem of excited motion (the Delaunay method) and successfully applied it (1860, 1867) to the calculation of the motion of the Moon. Studying the discrepancy between the calculated and observed values ​​of the Moon's age-related acceleration, he assumed in 1865 that it was caused by the slowing down of the Earth's rotation due to tidal friction; this assumption turned out to be correct. A number of studies are devoted to excitation in the movement of Uranus (1842), the theory of tides (1844). Member of the London Royal Society (1869), foreign corresponding member of the St. Petersburg Academy of Sciences (1871). Member of the Longitude Bureau in Paris (1862). Asteroid 8688 Delaunay is named after the scientist.

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Kolchinsky I.G., Korsun A.A., Rodriguez M.G. Astronomers: Biographical reference book. — 2nd ed., revised. and additional — K.: Naukova dumka, 1986. — 512 p.