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Pierre Jules César Janssen (22 February 1824 – 23 December 1907), usually known as Jules Janssen, was a French astronomer who, along with English scientist Joseph Norman Lockyer, is credited with discovering the gaseous nature of the solar chromosphere, but there is no justification for the conclusion that he deserves credit for the co ...
Pierre Janssen (born February 22, 1824, Paris, France—died December 23, 1907, Meudon) was a French astronomer who in 1868 discovered the chemical element helium and how to observe solar prominences without an eclipse.
- The Editors of Encyclopaedia Britannica
Pierre Janssen was the first to observe helium, an element never before seen on Earth, in the solar spectrum in 1868. He traveled across the world to study the sun and stars with a spectroscope, and shared the honor of discovery with English astronomer Norman Lockyer.
Aug 18, 2022 · Learn about the life and achievements of Pierre Janssen, who observed the solar eclipse of 1868 and discovered the new element helium. Find out how he also studied the solar chromosphere, the magnetic equator, and the transits of Venus.
The voyage that French astronomer Pierre Janssen undertook from Europe to the eastern Indian province of Madras during the spring of 1868 was no overnight endeavour. Janssen was travelling ...
Learn how Pierre Janssen, a French astronomer, observed the Sun's spectrum during a 1868 eclipse and discovered helium, the first element from space. Find out how helium was identified, what it is, and why it is rare on Earth.
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Aug 18, 2009 · French astronomer Pierre Jules César Janssen camped out in Guntoor, India, to watch as the moon passed in front of the sun and revealed the solar prominences. Like other sun-gazers that morning,...
