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Pierre Janssen was a French astronomer who in 1868 discovered the chemical element helium and how to observe solar prominences without an eclipse. His work was independent of that of the Englishman Sir Joseph Norman Lockyer, who made the same discoveries at about the same time.
- The Editors of Encyclopaedia Britannica
Pierre Janssen studied mathematics and physics at the faculty of sciences. He taught at the Lycée Charlemagne in 1853, and in the school of architecture 1865 – 1871, but his energies were mainly devoted to various scientific missions entrusted to him.
French astrophysicist Pierre Jules Janssen traveled across the world in an attempt to understand the cosmos, and was the first to sight the wavelength pattern of helium in his spectroscope.
Aug 18, 2014 · Born in Paris, Pierre Janssen suffered an accident as a child that left him permanently lame. He studied mathematics and physics at the University of Paris, eventually becoming a professor of architecture there in 1865.
On 18 August 1868, during a total solar eclipse observed from India, a French astronomer Pierre Janssen saw the same signature lines of colour through his spectroscope as Lockyer would two months later.
Aug 18, 2022 · When watching the total eclipse on August 18, 1868 in Madras, British India, French astronomer Pierre Janssen discovered the new chemical element Helium. Janssen also is credited with discovering the gaseous nature of the solar chromosphere.
Mar 27, 2024 · The chemical element helium was first observed during an 1868 solar eclipse in India. French astronomer Pierre Janssen focused a spectroscope on the solar prominence where he noticed a new, bright yellow line in the spectrum of the sun’s chromosphere.
