Solar Helium Spectrum18 August 1868
Observes a new yellow spectral line during a solar eclipse.
Historical person
Pierre Jules Cesar Janssen Biography
Historical biography and chronological timeline for Pierre Jules Cesar Janssen, based on 3 World History Database records associated with France.
3 records1868–18743 events2 places
Chronological biography
1868
Yellow Solar Spectral Line18 August 1868
Provides evidence for helium in the Suns atmosphere.
1874
Transit of Venus Photography9 December 1874
Janssen uses his photographic revolver during the transit of Venus to record a rapid sequence of solar images.
Titles and roles
Astronomer
Record provenance
This biography is assembled from World History Database records filtered by country and personal-name fields. Exact duplicate display records are removed. The database is an index rather than a complete narrative biography; formal research should verify entries against relevant primary or specialist sources.