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Pierre Janssen
Pierre Jules César Janssen, 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, and with some justification the element helium.
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science · French astronomer (1824–1907) · astronomer · photographer · physicist · geologist · inventor · university teacher · film director · film producer · cinematographer · film editor · also Pierre Janssen, P.J.C. Janssen, Jules Janssen (1824-1907), Pierre Jules César Janssen (1824-1907), Pierre Jules Cesar Janssen, G. Janssen
Born 22 February 1824 · Died 23 December 1907 · Q298581
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1874 Pierre Jules César Janssen - Passage de Venus
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2026· 1 entry
2019· 1 entry
Published “Reproducible, interactive, scalable and extensible microbiome data science using QIIME 2” in Nature Biotechnology — cited 21,047 times.
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2011· 1 entry
Published “Development and preliminary testing of the new five-level version of EQ-5D (EQ-5D-5L)” in Quality of Life Research — cited 8,486 times.
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1907· 2 entries
Died 1907-12-23.
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Career landmark: funeral.
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1895· 1 entry
Career landmark: chairperson (1895–1897).
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1893· 1 entry
Awarded Commander of the Legion of Honour (1893).
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1887· 1 entry
Career landmark: president of the French Academy of Sciences (1887–1888).
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1884· 1 entry
Took part in the International Meridian Conference
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1876· 1 entry
Won Rumford Medal (1876).
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1875· 2 entries
Awarded Foreign Member of the Royal Society (1875).
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Janssen was appointed director of the new astrophysical observatory established by the French government at Meudon, and set foot on there in 1876 the remarkable series of solar photographs collected in his great Atlas de
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1868· 3 entries
Awarded Lalande Prize (1868).
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Awarded Knight of the Legion of Honour (1868).
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Janssen discovered how to observe solar prominences without an eclipse
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1857· 1 entry
Went to Peru in order to determine the magnetic equator; in 1861–1862 and 1864, he studied telluric absorption in the solar spectrum in Italy and Switzerland; in 1867 he carried out optical and magnetic experiments at
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1853· 1 entry
And in the school of architecture 1865 – 1871, but his energies were mainly devoted to various scientific missions entrusted to him
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1824· 1 entry
Born 1824-02-22.
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