Untitled (Study of the Sun's Surface), Jules Cesar Janssen, 1893
Jules Janssen, ritrattoJules JanssenFrancia, 1824–1907

Untitled (Study of the Sun's Surface)

1893 · Photograph

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National Gallery of Art

Washington, Stati Uniti

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2006.133.85

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Nella vita di Jules Janssen

Tutta la vita
  1. 13 luglio 1893 · Premio

    Commander of the Legion of Honour

  2. 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.

  3. 1895

    Helium is found on Earth

    Helium, whose line Janssen had observed in 1868, was found on Earth by Ramsay in the mineral cleveite.

  4. 1895–1897

    Post: chairperson

  5. 1895–1897

    President of the Société Astronomique de France

    From 1895 to 1897 Janssen was president of the Société Astronomique de France.

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Anche in sala: National Gallery of Art

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Sullo stesso tema · Astronomy

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