La planète Neptune Book by Louis Figuier - Bookswagon
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La planète Neptune

La planète Neptune


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About the Book

"...De tels triomphes sont utiles et presque nécessaires pour entretenir la juste considération que l'on doit aux sciences. Nous sommes très-disposés, sans doute, à confesser l'importance des recherches scientifiques, mais il n'est pas hors de propos que, par intervalles, quelques faits éclatants viennent justifier cette confiance en quelque sorte instinctive, et nous fournir un témoignage visible de l'utilité de certains travaux dont les applications sont difficiles à saisir au premier aperçu. Rien n'a mieux servi à ce titre les intérêts et l'honneur des sciences que la découverte de la planète Neptune. L'histoire conserve avec orgueil les noms de quelques astronomes heureux qui reconnurent dans le ciel l'existence de planètes jusqu'alors ignorées; mais ces découvertes n'avaient en elles-mêmes rien d'inusité ni d'insolite, elles ne sortaient pas du cadre de nos moyens habituels d'exploration; le perfectionnement des instruments d'optique y joua le premier et quelquefois l'unique rôle. Les planètes Uranus, Cérès, Pallas, Vesta, Junon, Astrée, ont été reconnues en étudiant avec le télescope les diverses plages célestes. C'est par une méthode différente et bien autrement remarquable que M. Le Verrier a procédé. Il n'a pas eu besoin de lever les yeux vers le ciel. Sans autre secours que le calcul, sans autre instrument que sa plume, il a annoncé l'existence d'une planète nouvelle qui circule aux confins de notre univers, à douze cents millions de lieues du soleil. Non-seulement il a constaté son existence, mais il a déterminé sa situation absolue et les dimensions de son orbite, évalué sa masse, réglé son mouvement et assigné sa position à une époque déterminée; de telle sorte que, sans avoir une seule fois mis l'oeil à une lunette, sans avoir jamais observé lui-même, il a pu dire aux astronomes: À tel jour, à telle heure, braquez vos télescopes vers telle région du ciel, vous apercevrez une planète nouvelle. Aucun oeil humain ne l'a encore aperçue, mais je la vois avec les yeux infaillibles du calcul. Et l'astre fut reconnu précisément à la place indiquée par cette prophétie extraordinaire. Voilà ce qui fait la grandeur et l'originalité admirable de cette découverte positivement unique dans l'histoire des sciences..."
About the Author: Guillaume Louis Figuier, né à Montpellier le 15 février 1819 et mort le 8 novembre 1894 à Paris, 9ème, est un écrivain et vulgarisateur scientifique français.


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Product Details
  • ISBN-13: 9781533416506
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 229 mm
  • No of Pages: 32
  • Series Title: French
  • Weight: 109 gr
  • ISBN-10: 1533416508
  • Publisher Date: 24 May 2016
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Spine Width: 2 mm
  • Width: 152 mm


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