| Authorised form of name | Janssen; Pierre Jules Cesar (1824 - 1907) |
| Dates | 1824 - 1907 |
| Nationality | French |
| Place of birth | Paris, France |
| Date of birth | 22 February 1824 |
| Place of death | Meudon, France |
| Date of death | 23/12/1907 |
| Research field | Physical astronomy |
| Spectroscopy |
| Photography |
| Activity | Career:
Teacher, Lycee Charlemagne, Paris (1853); travelled to Peru to determine the magnetic equator (1857); Teacher, School of Architecture, 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)
|
| Membership category | Foreign Member |
| Date of election | 08/04/1875 |
| Royal Society activity | Medals and prizes:
Rumford Medal 1876 |
| Sources | Sources:
Bulloch's Roll; DSB
Obituaries:
Proc Roy Soc Series A 1908 vol 81 pp lxxvii-lxxxi signed by N L |
| Virtual International Authority File | http://viaf.org/viaf/61576849 |
| Royal Society code | NA6526 |
| Reference number | Title | Date |
| EC/1875/09 | Janssen, Pierre Jules Cesar: certificate of election to the Royal Society | |
| M/103 | Janssen, Pierre J C, and J Norman Lockyer | 18 August 1868 |
| NLB/11/1016 | Copy letter from Michael Foster, to Monsieur Professor Pierre Jules Cesar Janssen | [November 1895] |
| NLB/9/269 | Copy letter from Herbert Rix, to Professor Joseph Norman Lockyer, Fellow of the Royal Society | 24 April 1894 |
| NLB/9/244 | Copy letter from Herbert Rix, to Professor Joseph Norman Lockyer, Fellow of the Royal Society | 20 April 1894 |
| NLB/9/272 | Copy 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/19/55 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 8 June 1899 |
| NLB/11/999 | Copy letter from Michael Foster, to Monsieur Pierre Jules Cesar Janssen, Foreign Member of the Royal Society, Observatoire de Paris | 14 November 1895 |
| NLB/36/856 | Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons | 3 January 1908 |
| NLB/36/827 | Copy letter from Joseph Larmor, to the family of Pierre Jules Cesar Janssen and the authorities of the Observatory of Mendon | 24 December 1907 |
| NLB/22/613 | Copy letter from Sir Michael Foster, to M Le Professeur [Jules] Janssen | 12 June 1901 |
| MS/427/260 | Copy letter from [William] Spottiswoode, President of the Royal Society; to Mr. [Pierre] Jules [Cesar] Janssen (Foreign Member, FRS) | 17 February 1883 |
| MC/8/292 | Letter from [Pierre Jules Cesar] Janssen, Simla, Himalaya, to W [Warren] de la Rue | 2 January 1869 |
| MC/8/311 | Letter from Warren de la Rue, 139 Marina Parade, Brighton, to Professor [George Gabriel] Stokes, Secretary of the Royal Society | 2 February 1869 |
| MC/10/278 | Letter from J [Jules] Janssen, Paris, to [Joseph Dalton Hooker], President of the Royal Society | 20 July 1875 |
| MC/10 | Volume 10 of miscellaneous correspondence regarding business matters, sent to the Royal Society | July 1873-1876 |
| MC/11/132 | Letter from Warren de la Rue, 73 Portland Place, to Walter White, [Assistant Secretary of the Royal Society] | 8 December 1877 |
| MC/11 | Volume 11 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1877-1879 |
| MC/12/304 | Letter from J [Jules] Janssen, Astrophysical Observatory of Paris, Sis Parc de Meudon, Leine & Oise, to [William Spottiswoode], President of the Royal Society | 8 February 1883 |
| MC/12 | Volume 12 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1880-1883 |
| MC/8 | Volume 8 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1867-1869 |
| AP/60/2 | Unpublished letter, regarding a solar photograph by [Pierre Jules] Janssen from Warren de la Rue to Walter White | 8 December 1877 |