File:Astronomie (1771) (14592414218).jpg

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Identifier: astronomie02lala (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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Text Appearing Before Image:
Tome U-Paoc -).8o. PL XI.
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7omen Pa^e. 48c. Méthodes pour calculer les Eclipfes, 489 En effet, fuppofons pour rendre les ehofes très-fen- .fibles, & les calculs très-fimples que le point K où eft ^* ^^^lobfervateur^ foit à la moitié de IL ou de la diilancede la lune, que le rayon de projection LA au lieudêtre dun degré paroiffe de deux degrés ; que le mou-vement horaire vu du point K ait également doublé6c foit dun degré, ôc le diamètre de la lune dun de-gré ; fi le diamètre du foleil étoit auffi double & qu ilparût dun degré, la diftance des centres CL commen-cement de léclipfe feroic de 1°, & ce commencementparoîtroit arriver une heure avant que la lune fût aupoint li, ou fe fait la conjoniStion; & il en feroit toutde même pour le centre T de la terre, où les quan-tités précédentes paroîtroient moindres de moitié ; maisfi le demi-diamètre du foleil ne participe pas à cetteaugmentation vue du point K , il faudra pour réduiretout à ce quon auroit vu du centre de

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2
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29 July 2014

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