Janssen and Lockyer, 1868. Pierre Jules Cesar Janssen (1824-1907), French astronomerand 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. Reverse of a commemorative medal showing Phaeton driving his father Apollo's chariot near the sun.
Caption

Janssen and Lockyer, 1868. Pierre Jules Cesar Janssen (1824-1907), French astronomerand 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. Reverse of a commemorative medal showing Phaeton driving his father Apollo's chariot near the sun.

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