Record

Authorised form of nameJanssen; Pierre Jules Cesar (1824 - 1907)
SurnameJanssen
ForenamesPierre Jules Cesar
Dates1824 - 1907
NationalityFrench
Dates and placesBirth:
Paris, France (22 February 1824)
Death:
Meudon, France (23 December 1907)
ActivityResearch Field:
Physical astronomy, spectroscopy, photography
Career:
Teacher, Lycee Charlemagne, Paris (1853); travelled to Peru to determine the magnetic equator (1857); Teacher, School of Archictecture, Paris (1865-1871); made magnetic observations in the Azores (1867) and at Oran, Algeria (1882); observed solar eclipses in Algiers, for which he escaped from Paris in a hot air balloon (1870), Siam (1875), Caroline Islands (1883) and Spain (1905); Director, Astrophysical Observatory established by the French government, Meudon (1875)
Royal Society activityMembership:
Foreign Member
Election Date:
8/04/1875
Medals/Prizes:
Rumford Medal 1876
SourcesSources:
Bulloch's Roll; DSB
Obituaries:
Proc Roy Soc Series A 1908 vol 81 pp lxxvii-lxxxi signed by N L
Royal Society codeNA6526
Archives associated with this Fellow
Reference numberTitleDate
EC/1875/09Janssen, Pierre Jules Cesar: certificate of election to the Royal Society
M/103Janssen, Pierre J C, and J Norman Lockyer18 August 1868
NLB/11/1016Copy letter from Michael Foster, to Monsieur Professor Pierre Jules Cesar Janssen[November 1895]
NLB/9/269Copy letter from Herbert Rix, to Professor Joseph Norman Lockyer, Fellow of the Royal Society24 April 1894
NLB/9/244Copy letter from Herbert Rix, to Professor Joseph Norman Lockyer, Fellow of the Royal Society20 April 1894
NLB/9/272Copy letter from Lord Rayleigh [John William Strutt], to Monsieur Pierre Jules Cesar Janssen, Foreign Member of the Royal Society, Observatoire de Meudon, Seine et Cise, France[24 April 1894]
NLB/19/55Copy letter from Theodore E James, to Messrs Harrison & Sons8 June 1899
NLB/11/999Copy letter from Michael Foster, to Monsieur Pierre Jules Cesar Janssen, Foreign Member of the Royal Society, Observatoire de Paris14 November 1895
NLB/36/856Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons3 January 1908
NLB/36/827Copy letter from Joseph Larmor, to the family of Pierre Jules Cesar Janssen and the authorities of the Observatory of Mendon24 December 1907
MS/427/260Copy letter from [William] Spottiswoode, President of the Royal Society; to Mr. [Pierre] Jules [Cesar] Janssen (Foreign Member, FRS)17 February 1883
NLB/22/613Copy letter from Sir Michael Foster, to M Le Professeur [Jules] Janssen12 June 1901
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