Jules JanssenFrankrig, 1824–1907Untitled (Study of the Sun's Surface)
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Washington, D.C., USA
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Imens i livet hos Jules Janssen
Hele livet13. juli 1893 · Udmærkelse
Commander of the Legion of Honour
1893
Up Mont Blanc at sixty-nine
To learn whether the Sun contains oxygen, Janssen conceived an observatory on the summit of Mont Blanc, above much of the Earth's air. It was built in September 1893 on foundations set in ice more than ten metres deep, and despite his sixty-nine years he made the ascent and spent four days observing.
1895
Helium is found on Earth
Helium, whose line Janssen had observed in 1868, was found on Earth by Ramsay in the mineral cleveite.
1895–1897
Post: chairperson
1895–1897
President of the Société Astronomique de France
From 1895 to 1897 Janssen was president of the Société Astronomique de France.
![Ginevra de' Benci [obverse], Leonardo da Vinci, c. 1474/1478](https://api.nga.gov/iiif/8f29e3c9-a289-4d53-abf0-31a66e9e98fa/full/!2400,2400/0/default.jpg)
![Wreath of Laurel, Palm, and Juniper with a Scroll inscribed Virtutem Forma Decorat [reverse], Leonardo da Vinci, c. 1474/1478](https://api.nga.gov/iiif/ff62e8d0-45c4-498f-ad36-6358de827e04/full/!2400,2400/0/default.jpg)
