ASTRONOMER

André-Louis Danjon

1890 - 1967

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André-Louis Danjon (French: [ɑ̃dʁelwi dɑ̃ʒɔ̃]; 6 April 1890 – 21 April 1967) was a French astronomer who served as director of the Observatory of Strasbourg from 1930 to 1945 and of the Paris Observatory from 1945 to 1963. He developed several astronomical instruments to examine the regularity of the rotation of the earth and among his discoveries was an acceleration of the rotation of the Earth during periods of intense solar activity occurring in 11-year cycles correlated with an increase in earthquakes. The Danjon scale is used for measuring the intensity of lunar eclipses. He noted an increase in the number of dark lunar eclipses with solar activity which is termed as the Danjon effect. Read more on Wikipedia

His biography is available in different languages on Wikipedia. André-Louis Danjon is the 279th most popular astronomer (down from 266th in 2019), the 2,987th most popular biography from France (up from 3,178th in 2019) and the 29th most popular French Astronomer.

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Among ASTRONOMERS

Among astronomers, André-Louis Danjon ranks 279 out of 644. Before him are Pierre Charles Le Monnier, Sandra Faber, Daniel Kirkwood, Antonia Maury, Marguerite Laugier, and Giovanni Domenico Maraldi. After him are Geminiano Montanari, Philibert Jacques Melotte, Heber Doust Curtis, Raymond Smith Dugan, Harold Spencer Jones, and James W. Christy.

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Contemporaries

Among people born in 1890, André-Louis Danjon ranks 120. Before him are Jüri Uluots, Paul Strand, Kazimierz Ajdukiewicz, Michał Rola-Żymierski, Jelly Roll Morton, and Mustafa Shokay. After him are Adolf Wagner, Harold Spencer Jones, Maurice McLoughlin, Arthur Holmes, Helge Løvland, and Rachel Bluwstein. Among people deceased in 1967, André-Louis Danjon ranks 123. Before him are Alice B. Toklas, Pavlo Tychyna, Greta Schröder, Varian Fry, Sydir Kovpak, and Josef Frank. After him are Abelardo L. Rodríguez, Julio Baghy, Isaac Deutscher, Richard Ruoff, Enrico Dante, and Manuel Prado Ugarteche.

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In France

Among people born in France, André-Louis Danjon ranks 2,987 out of 6,770. Before him are Jean Guitton (1901), Marguerite Laugier (1896), Bernard Plantapilosa (841), Charles Mangin (1866), François Coty (1874), and Jean Jouvenet (1644). After him are Antoine III de Gramont (1604), André Hunebelle (1896), Émile Cohl (1857), Louis Auguste Le Tonnelier de Breteuil (1730), Marie of Lorraine (1674), and Henriette d'Angeville (1794).

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Among ASTRONOMERS In France

Among astronomers born in France, André-Louis Danjon ranks 29. Before him are Joseph Jean Pierre Laurent (1823), Benjamin Baillaud (1848), Henri-Alexandre Deslandres (1853), Dominique, comte de Cassini (1748), Pierre Charles Le Monnier (1715), and Marguerite Laugier (1896). After him are Jean Fernel (1497), Laurent Cassegrain (1629), Hervé Faye (1814), Guillaume Le Gentil (1725), Charles Wolf (1827), and Georges Rayet (1839).

French born Astronomers

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