Descartes, René - Renati Des-Cartes principia philosophiae

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1ſupereſt alius regularis ejus motus, quo bis in die ſin
gulis in locis attollitur & deprimitur, interimque ſem
per ab Oriente in Occidentem fluit. Ad cujus motûs
cauſſam explicandam, ponamus nobis ob oculos exi
guum illum coeli vorticem, qui Terram pro centro
habet, quique cum illâ & cum Lunâ in maiori vortice
circa Solem fertur. Sitque ABCD ille exiguus vortex a;

EFGH Terra; 1234 ſuperficies maris, à quo, majoris
perſpicuitatis cauſſâ, Terram ubique tegi ſupponimus;
&s5678 ſuperficies aeris mare ambientis. Jamque con
ſideremus, ſi nulla in iſto vortice Luna eſſet, punctum
T, quòd eſt centrum Terrae, fore in puncto M, quòd
eſt vorticis centrum; ſed Lunâ √á exſiſtente verſus B,

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