André-Louis Danjon

Article abstract: Danjon primarily worked to increase the precision of astronomical instruments in observing stars. The invention of the prismatic 60 degree astrolabe, or the Danjon astrolabe, is his crowning achievement. Toward the end of his career, in the 1950’s, he also investigated irregularities in the rotation of Earth.

Early Life

André-Louis Danjon attended the École Normale Supérieure in Paris from 1910 until the outbreak of World War I in 1914. During the war, he served in the French army. After his release from the military in 1919, he...

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