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Jules Janssen; photograph by Nadar (date unknown) Photo taken by Janssen, from the Meudon observatory, of Renard and Krebs' La France dirigible (1885). Pierre Jules César Janssen (22 February 1824 – 23 December 1907), 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 ...
Pieter "Pier" Janssen (born 9 September 1956), also referred to as Pierre or Piet, is a Belgian former footballer and manager who played as a midfielder and made three appearances for the Belgium national team.
The chief developer was Pierre Janssen, who orchestrated the construction of the large refractor. [2] Janssen was famous for his role in the discovery of Helium in 1868, and by 1875 he was authorized to build a large astrophysical observatory. [4]
Pierre Georges Cornil Jansen (28 February 1930 [1] – 13 August 2015 at Saint-Pierre-Saint-Jean) [2] was a French film scores composer. He was in particular the permanent collaborator of Claude Chabrol for whom he composed the music for many films.
French astronomer Pierre Janssen observed the eclipse from Guntur in Madras State, British India.It was the first total eclipse since Gustav Kirchhoff's 1859 theory that the Fraunhofer lines in the solar spectrum correspond to the emission line of the different chemical elements present in the Sun. Correspondingly, Janssen observed the eclipse with the aid of a spectroscope.
The transit as seen from Japan by Pierre Janssen Map showing the visibility of the 1874 transit of Venus. The 1874 transit of Venus, which took place on 9 December 1874 (01:49 to 06:26 UTC), [1] [n 1] was the first of the pair of transits of Venus that took place in the 19th century, with the second transit occurring eight years later in 1882.
Frenchman inventor Janssen came up with the idea for a "revolver photographic". This was a large camera based on the Maltese cross mechanism, which is an important milestone in the development of cameras used to film movies. [9] The revolver could take several dozens of exposures at regulated intervals on a daguerreotype disc. [10]
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