File:Astronomie (1771) (14747865246).jpg

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Identifier: astronomie03lala (find matches)
Title: Astronomie
Year: 1771 (1770s)
Authors: Lalande, Joseph Jérôme Le Français de, 1732-1807 John Adams Library (Boston Public Library) BRL Dupuis, 1742-1809 Adams, John, 1735-1826, former owner
Subjects: Astronomy Tides Constellations
Publisher: A Paris : Chez la Veuve Desaint ...
Contributing Library: John Adams Library at the Boston Public Library
Digitizing Sponsor: Sloan Foundation

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ur repréfenter méthodiquementces inégalités, fuppofent que la planète eft toujours dansle même plan ou fur la même orbite , mais que cetteorbite change de fituation ; on peut en effet repréfentertous les mouvemens dune planète hors du plan de fonorbite primitive en donnant à ce plan un changementdinclinaifon, avec un mouvement dans fes nœuds , quifoit tel que le plan quon adopte, fuive la planète danstoutes fes inégalités. On fentira même fans autre démonftration qu-il eft ini-poffible quune planète attirée, dont lorbite eft dans un- autre plan que celle de la planète perturbatrice vienne jamais traverfer le plan de celle-ci, au même point oùelle lavoit traverfé dans la révolution précédente : elledoit à chaque fois le traverfer plutôt quelle neût fait,fi la planète perturbatrice ne leût point attirée vers ceplan ; elle a fans ceffe une détermination ou une forcevers le plan où fe trouve la planète qui lattire , & elle ne ^Ljtionoiiue PI JiJLKJJC.
Text Appearing After Image:
ToimBITaiie foo. Du mouvement des Nœuds. 601 ne peut obéir à cette force quen arrivant à ce plan unpeu avant la fin de fa révolution. 3516. Soit DN (f^. 2i?p ) lécliptique ; LâBN lor- p/. xl.bite de la lune , ceft-à-dire, lorbite dans laquelle la lune f/^. 199.étoit dabord, en parcourant larc LA ; le foleil étant placédans le plan de lécliptique DN, il eft clair quen touttemps la force attradive du foleil tend à rapprocher lalune du plan de lécliptique ou de la ligne DN, danslaquelle fe trouve le foleil ; ainfi lorfque la lune tendà parcourir dans fon orbite un fécond efpace AB égal àlefpace LA quelle venoit de parcourir, la force du foleiltend à la rapprocher de lécliptique ND dune quantitéyîE •■, il faut néceffairement que la lune par un mouvementcompofé décrive la diagonale yiC, du parallélogrammeyl ECB i enforte que fon orbite devienne ACM, au lieude LABJV; ceft pourquoi le nœud A^ de cette orbitechange continuellement de pofition & va de A^ en j

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3
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28 July 2014



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current08:28, 3 October 2015Thumbnail for version as of 08:28, 3 October 20151,844 × 2,322 (671 KB) (talk | contribs)== {{int:filedesc}} == {{information |description={{en|1=<br> '''Identifier''': astronomie03lala ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fastronomie03lala%2F find matches])<...

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