File:Astronomie (1771) (14592360189).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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-tout vers le troifième jour de lalune , ôc le matin aux environs de léquinoxe duprintemps. Quoique la lumière cendrée doive aller en diminuant,du jour même de la nouvelle lune , ceft cependantvers le troifième jour quelle eft la plus fenfible pournous 5 parce que la lune eft alors plus dégagée desrayons du foleil ; ceft auflî aux environs de léquinoxedu printemps, quand la lune ayant une grande latitu--de feptentrionale fe couche long-temps après le foleil,que cette lumière eft la plus fenfible. Elle difparoîeprefque entièrement quand la lune eft en quadrature,ï°. Parce que la terre envoyé alors quatre fois moins derayons vers la lune, 2°. Parce que la phafe de la lune(Revenue 4 à 5 fois plus grande nous empêche de ladiftinguer. Par la même raifon cette lumière cendréeparoît un peu plus vive fuivant le témoignage dHévé-lius, quand la lune eft dans fon décours, & quellejaiolt is matin ^ (j«oiquà même diftançe du foleil ôc à Mù-onotme ■ Pi- VI-
Text Appearing After Image:
TomeU.Fqpe lç î. Des Phafes de la Lune, 193 à pareille phafe, parce que la lumière de la partieorientale de la terre efl; plus vive, tandis que ceile dela partie orientale de la lune efl: un peu plus foible àcaufe des taches obfcures qui sy trouvent ; dailleursla prunelle efl: plus dilatée après les ténèbres de la nuitquaprès léclat du grand jour. ( Hevel, Senelog, pag, 5^7^ 399) La lumière cendrée efl caufe dun autre phénomèneoptique, fort fenfible , 6c quHévélius explique affezmalpar la comprefllon de la lumière ( pag, 287) , ceft ladilatation apparente du croiiTant lumineux, qui paroîcêtre dun diamètre beaucoup plus grand que le difqueobfcur de la lune ; cela vient de la force dune grandelumière placée à côté dune petite, lune efface lautre ,ôc la tue comme difent les peintres à loccafion descouleurs , le croiffant paroît enflé par un débordemendde lumière qui séparpille dans la rétine de lœil , ÔCélargit le difque de la lune ; lair ambiant écl

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29 July 2014



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current08:06, 3 October 2015Thumbnail for version as of 08:06, 3 October 20151,908 × 2,408 (650 KB) (talk | contribs)== {{int:filedesc}} == {{information |description={{en|1=<br> '''Identifier''': astronomie02lala ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fastronomie02lala%2F find matches])<...

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