Pierre Jules César Janssen
1824–1907
French astronomer. Sent on an official mission to study the position of the magnetic equator in Peru, 1857. Professor of physics at the École spéciale d’architecture from 1865. Travelled to India for the solar eclipse in 1868. Director of the observatory at Meudon from 1876. Best known for his work on solar photography.
Source
DSB.
Bibliography
DSB: Dictionary of scientific biography. Edited by Charles Coulston Gillispie and Frederic L. Holmes. 18 vols. including index and supplements. New York: Charles Scribner’s Sons. 1970–90.
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