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Janssen, Pierre Jules César 1824-1907
French astronomer
Born in Paris, he became head of the Astrophysical Observatory at Meudon in 1876, and greatly advanced spectrum analysis by his observation of the bright line spectrum of the solar atmosphere (1868). He established an observatory on Mont Blanc, and published a pioneering book of celestial photographs, Atlas de photographies solaires (1904, 'Atlas of Solar Photographs').
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The Chambers Dictionary (13th edition)
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The Chambers ThesaurusÂ
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Chambers Biographical Dictionary
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Thoroughly revised and updated for its 9th edition.
Consult Chambers 21st Century Dictionary, The Chambers Thesaurus (1996) or Chambers Biographical Dictionary (1997 edition with amendments). Enter your search and choose your title from the drop-down menu.
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