Pierre Jules César Janssen was born in Paris, France back in 1824 to Antoine and Pauline. He studied mathematics and physics, at the University of Paris. After graduation, he taught at Lycée Charlemagne. His interests were in astronomy, so he devoted most of his life to observation of solar eclipses.
He travelled to several locations to observe eclipses. He was in Paris in 1870 during the Siege of Paris, he escaped in a balloon. He died in Meudon, France in 1907, he was 83.
What you may not know about Pierre is that he was noted for inventing the Revolver of Janssen which was the precursor of the motion picture industry. He is also noted for discovering helium.
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