Janssen and Lockyer, 1868. Pierre Jules Cesar Janssen (1824-1907), French astronomer

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Janssen and Lockyer, 1868. Pierre Jules Cesar Janssen (1824-1907), French astronomer

Janssen and Lockyer, 1868. Pierre Jules Cesar Janssen (1824-1907), French astronomer, left, and Joseph Norman Lockyer (1836-1920), English astronomer. In 1868 while making spectroscopic studies of solar prominences, working independently, both men observed a yellow line in the solar spectrum. Lockyer named it Helium from helios, sun. Obverse of a commemorative medal

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Media ID 9767879

© Universal History Archive/Universal Images Group

1824 1907 1868 Astronomer Astronomy Cesar Commemorative Helios Joseph Jules Left Line Making Medal Named Norman Observed Obverse Pierre Scientist Solar Spectroscopy Spectrum Studies Working Yellow Helium Independently Janssen Lockyer Prominences Spectroscopic

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