Daniel Chalonge (January 21, 1895 – November 28, 1977) was a Frenchastronomer andastrophysicist. He was born inGrenoble and studied in Paris underCharles Fabry.[1] Chalonge worked as an astronomer at theObservatoire de Paris, the Observatoire d'Haute Provence and the Swiss Jungfraujoch Scientific Station. One of the founders of theInstitut d'astrophysique de Paris, his studies included the stellarspectrum ofhydrogen, stellarphotometry and classification, and measurement of theozone layer. During the Nazi occupation of France, Chalogne assumed the position of director of the Institut d'astrophysique de Paris after the previous director, Henri Mineur, was arrested by theGestapo.[2] Chalonge developed a microphotometer, which was subsequently named after him. Between 1936 and 1982 he authored (or co-authored) over 90 scientific papers.
Chalonge died inParis, survived by his wife and two daughters, Karen and Sonia.[2]
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