Marie Henri Andoyer

Marie Henri Andoyer ( born October 1, 1862 in Paris, † June 12, 1929 ) was a French astronomer and mathematician.

Life

Andoyer attended the Lycée Saint Louis in Paris and studied from 1881 to 1884 at the Ecole Normale Superieure, with a degree ( aggregation) in mathematics. After that, he was an assistant at the Observatoire de Toulouse and lecturer at the Faculté des Sciences in Toulouse. In 1886 he was in Paris doctorate ( Contribution à la théorie of Orbite intermédiaires ) and was then Maître de conférences in Toulouse. From 1889 he worked at the Observatory of Toulouse responsible for participation in the new sky card ( Carte du Ciel ). In 1892 he was Maitre de Conference for celestial mechanics and astronomy at the Paris Faculty of Sciences, where he had the title of professor in 1903. In 1912 he became the successor of Henri Poincaré as a professor of astronomy and celestial mechanics. In 1905 he took part in the expedition to observe the total solar eclipse on August 30 in El- Arrouch in Algeria. He was a member of the Bureau des Longitudes. The offer to become director of the Paris Observatory, he refused.

He was instrumental in the review of the extensive calculations of Charles -Eugène Delaunay to the lunar theory and showed that they all were inaccurate from the 7th-order perturbation theory. His examination of the error in the calculations Delaunay he continued until his death. Next he worked on intermediate tracks after Hugo Gylden. In the obituary in Nature, the rare combination of mathematical astronomy and practical observing experience is highlighted, his reputation as a teacher as well as a preference for extensive calculations, which was also reflected in the publication and production of mathematical tables.

From 1911 he was the successor of Rodolphe Radau editor of the astronomical yearbook Connaissance des temps.

In 1919 he became a member of the Académie des Sciences. At his death he was Vice President of the International Astronomical Union, and before that he was president of the Commission for ephemeris and celestial mechanics. He was an officer of the Legion of Honour.

Andoyer wrote several school textbooks on geometry and algebra ( Leçons élémentaires sur la théorie des formes et ses applications géométriques, Gauthier -Villars 1898), trigonometric and logarithm tables, a book about the moon theory (theory de la Lune, 1902, 1926), about the scientific work of Pierre Simon de Laplace (1922 ), a textbook of astronomy ( Cours d' Astronomy, 3 vols, 1906, 1909, 1928) and a textbook on celestial mechanics ( Cours de la mecanique celeste, 2 volumes, 1923, 1926).

Andoyer had two sons (one of which fell in the first world war ), and a daughter who was married to the mathematician Pierre Humbert.

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