Descartes, René - Renati Des-Cartes principia philosophiae

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1ibique non aliter gyrans, quàm ea quae intra maculam
continetur, non minori vi pellet globulos coeli circum
poſitos, quàm eoſdem pelleret ipſum ſidus I, ſi nulla
macula illud involvens ejus actionem impediret: at
que ita magnâ luce ex improviſo fulgebit.

CXI.
Deſcriptio ſtellae ex im
proviſo apparentis.

39[Figure 39]

Jam verò, ſi fortè contingat, iſtam maculam eſſe

tam tenuem & raram, ut à materià primi elementi,
ſupra ejus exteriorem ſuperficiem ſic effuſâ, diſſol
vatur, non facilè poſtea ſidus I rurſus diſparebit: ad
hoc enim opus eſſet, lit nova macula ipſum
rurſus involveret. Sed ſi craſſior ſit quàm ut ita queat
diſſolvi, denſabitur exterior ejus ſuperficies a, ob

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