Henri Andoyer

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

Life

Andoyer attended the Lycée St. Louis in Paris and studied from 1881 to 1884 at the École normal supérieure , with a degree (aggregation) in mathematics. He then worked as an assistant at the Observatoire de Toulouse and lecturer at the Faculté de Sciences in Toulouse. In 1886 he received his doctorate in Paris ( Contribution à la théorie des orbites intermédiaires ) and was then Maître de conférences in Toulouse. From 1889 he was responsible for the participation in the new sky map (Carte du Ciel) at the Toulouse Observatory. 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 from 1903. In 1912 he succeeded Henri Poincaré as professor of astronomy and celestial mechanics. In 1905 he took part in the expedition to observe the total solar eclipse on August 30th in El-Arrouch in Algeria . He was a member of the Bureau des longitudes. He turned down the offer to become director of the Paris Observatory.

He was instrumental in checking the extensive calculations of Charles-Eugène Delaunay on the lunar theory and showed that these were all imprecise from the 7th order perturbation theory. He continued his investigation into the errors in Delaunay's calculations until his death. He also dealt with intermediate railways following Hugo Gyldén . The obituary in Nature emphasizes the rare combination of mathematical astronomy and practical observational experience, his reputation as a teacher and a preference for extensive calculations, which is also reflected in the publication and creation of mathematical tables.

From 1911 he succeeded Rodolphe Radau as 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 its Commission on Ephemeris and Celestial Mechanics. He was an officer in the Legion of Honor.

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

Andoyer had two sons (one of whom died in World War I ) and a daughter who was married to the mathematician Pierre Humbert .

Web links

Individual evidence

  1. ^ Obituary in Nature 1929

[[Category: University Lecturers ()]]

personal data
SURNAME Andoyer, Henri
ALTERNATIVE NAMES Andoyer, Marie Henri (full name)
BRIEF DESCRIPTION French astronomer and mathematician
DATE OF BIRTH October 1, 1862
PLACE OF BIRTH Paris
DATE OF DEATH June 12, 1929