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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 ...
Mar 23, 2021 · During the War of 1870, astronomer Jules Janssen risked his life for scientific prestige and French patriotism.
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.
Jul 22, 2012 · Impressed and fascinated by the spectroscopic work of Gustav Kirchhoff and Robert Bunsen, Janssen began his studies of the solar spectrum in 1862. His first important contribution was to demonstrate that some of the dark lines observed in the solar spectrum were caused by water vapor in the Earth's atmosphere.
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
Tennant's team moved into the British government compound, while Janssen set up at the home of one Jules Lefaucheur. Janssen generously helped Tennant to set up his spectroscope and telescope. When the eclipse occurred, all the investigators paid attention to the spectrum.
Pierre Jules César Janssen (22 February 1824 – 23 December 1907), also known as Jules Janssen, was a French astronomer inventor, and photographer who, along with the English scientist Joseph Norman Lockyer, is credited with discovering the gaseous nature of the solar chromosphere, and with some justification the element helium.
