Descartes, René
,
Renati Des-Cartes principia philosophiae
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quia materia vorticis ſ vertitur ab A per E verſusv, &
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materia vorticis S ab A per E verſus I; iſtius autem
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lineae pars 5 6 7 8 eſt ferè recta, quia materia vorticis in
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quo eſt, ſupponitur gyrare circa axem XX. </
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ex unis vorticibus in alios hoc pacto migrantia
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Cometae: ipſorumque omnia phaenomena hîc expli
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care conabor. </
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CXXVII.
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De continuatione mo
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tùs Cometae per di
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verſos vortices. </
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In primis obſervatur illos ſine ullâ regulâ nobis
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notâ, unum per hanc, alium per illam coeli regionem
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tranſmeare, ac intra paucos menſes aut dies
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con
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ſpectu noſtro abire, nec unquam plus, aut certè non
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multò plus, ſed ſaepe multò minùs quàm mediam coeli
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partem percurrere. </
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>Ac quidem cùm primùm apparere
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incipiunt, ſolere ſatis magnos videri, nec poſtea valde
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augeri, niſi cùm valde magnam coeli
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percur
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runt; cùm autem deſinunt, gradatim ſemper imminui;
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atque initio, vel ſaltem circa initia ſui motùs, videri
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celerrim moveri, ſub finem autem lentiſſimè. </
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uno duntaxat memini me legiſſe, quòd circiter me
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diam coeli partem peragrârit: de illo ſcilicet
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di
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citur anno 1475, primò tenui capite ac tardi motûs,
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inter ſtellas Virginis apparuiſſe, ac paulò pòſt mirae
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magnitudinis factus, per polum Borealem tam cele
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riter inceſſiſſe, ut portionem circuli magni triginta
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vel quadraginta graduum, unâ die, deſcripſerit; ac
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