Descartes, René
,
Renati Des-Cartes principia philosophiae
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ibique non aliter gyrans, quàm ea quae intra maculam
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continetur, non minori vi pellet globulos coeli circum
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poſitos, quàm eoſdem pelleret ipſum ſidus I, ſi nulla
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macula illud involvens ejus actionem impediret: at
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que ita magnâ luce ex improviſo fulgebit.
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CXI.
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Deſcriptio ſtellae ex im
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proviſo apparentis. </
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Jam verò, ſi fortè contingat, iſtam maculam eſſe
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tam tenuem & raram, ut à materià primi elementi,
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ſupra ejus exteriorem ſuperficiem ſic effuſâ, diſſol
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vatur, non facilè poſtea ſidus I rurſus diſparebit: ad
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hoc enim opus eſſet, lit nova macula ipſum
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rurſus involveret. </
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diſſolvi, denſabitur exterior ejus ſuperficies a, ob </
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