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Journal Des Savants, 1857 (Classic Reprint): (French)

Journal Des Savants, 1857 (Classic Reprint): (French)

          
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About the Book

Excerpt from Journal des Savants, 1857

A l'epoque ou ces diverses conventions furent etablies, chaque (10 decatemoric de l'oblique contenait effectivement le groupe stellaire dont la denomination lui etait appliquee. Mais Hipparque fit une de couverte qui presageait que cet accord ne serait pas durable. Un siecle et demi environ avant lui, Timocharis avait pris quelques mesures d'arcs celestes. Il avait trouve ainsi que la belle etoile appelee l'ep'i de la Vierge, qui est situee presque exactement sur le cercle oblique, etait plus occidentale que le point equinoxial d'automne, d'une quantite qu'il evaluait a En comparant ses propres determinations a celle - la n'en possedant pas sans doute de plus anciennes auxquelles il put avoir con Rance, Hipparque constate que cette distance n'etait plus actuellement que de D'apres cela, puisque l'etoile etait fixe dans le ciel, il fallait que le point equinoxial eut marche vers l'occident pour se rapprocher d'elle, entrainant a sa suite toutes les dodecatemories mathematiques. Hipparque appliqua la meme epreuve a d'autres etoiles situees en d'au tres points de l'oblique. Elles s'accorderent pour attester l'existence du mouvement de conversion general des dodecatemories, s'operant de l'orient vers l'occident autour de l'axe de ce grand cercle; de sorte que les longitudes des astres meme fixes, etant mesurees de l'occident vers l'orient, a partir du point equinoxial du printemps, qui recule devant eux en sens contraire, elles doivent progressivement s'accroitre. Hip parque enonca seulement cette augmentation progressive a titre de fait, ne trouvant pas dans les observations anterieures des donnees assez anciennes, et qui lui parussent assez sures pour en assigner la grandeur. Ptolemee confirma, je devrais plutot dire s'appr0pria, la decouverte d'hipparque. Il estima que la retrogradation etait de 1 en 100 ans et il lui attribua cette valeur dans ses calculs. Maintenant que nous la con naissons mieux, nous savons qu'elle est en realite plus rapide, 'et que, de son temps, elle s'elevait a un degre en moins de 72 annees. Par une consequence necessaire de ce phenomene, lorsque le soleil, parti du point equinoxial de printemps, parcourt sa route annuelle, il rejoint ce point avant d'avoir decrit le contour entier de l'obliquc; et ainsi l'epoque de son retour suivant, a cet equinoxe, en est avancee. C'est pourquoi ce mouvement de retrogradation du point equinoxial d'ou les longitudes se comptent, est appele la precession des equinoees l'epoque annuelle de ces phenomenes precedant toujours celle ou ils auraient lieu, si ce point n'avait pas retrog1ade dans l'intervalle du de part au retour.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.


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Product Details
  • ISBN-13: 9780243223619
  • Publisher: Forgotten Books
  • Publisher Imprint: Forgotten Books
  • Height: 229 mm
  • No of Pages: 796
  • Series Title: French
  • Weight: 1046 gr
  • ISBN-10: 0243223617
  • Publisher Date: 16 Dec 2018
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Spine Width: 40 mm
  • Width: 152 mm


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