Pierre Jules Cesar Janssen ( 1824 - 1907 )

Birth: Paris, France (22 February 1824) Death: Meudon, France (23 December 1907) Research Field: Physical astronomy, spectroscopy, photography Career: Teacher, Lycee Charlemagne, Paris (1853); travelled to Peru to determine the magnetic equator (1857); Teacher, School of Archictecture, Paris (1865-1871); made magnetic observations in the Azores (1867) and at Oran, Algeria (1882); observed solar eclipses in Algiers, for which he escaped from Paris in a hot air balloon (1870), Siam (1875), Caroline Islands (1883) and Spain (1905); Director, Astrophysical Observatory established by the French government, Meudon (1875) Membership: Foreign Member Election Date: 8/04/1875 Medals/Prizes: Rumford Medal 1876.