Descartes, René, Renati Des-Cartes principia philosophiae

Table of figures

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              tandem prope ſtellas Piſcis ſeptentrionalis, ſive in
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              ſigno Arietis paulatim videri deſiiſſe. </s>
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              CXXVIII.
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              Phaenomena Cometa­
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              rum. </s>
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              10</s>
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              15</s>
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              20</s>
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              25</s>
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              Quae omnia hîc facilè intelliguntur. </s>
              <s>Videmus enim
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              eundem Cometam, aliam coeli partem in vortice F,
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              aliamque in vortice Y permeare, ac nullam eſſe per
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              quam non poſſe hoc pacto aliquando tranſire. </s>
              <s>Putan­
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              dumque eſt ipſum ferè eandem celeritatem ſemper
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              retinere: illam ſcilicet quam acquirit tanſeundo per
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              vorticum extremitates, ubi materia coeleſtis tam citò
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              movetur, ut intra paucos menſes integrum gyrum
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              abſolvat, quemadmodum ſuprà dictum eſt a. </s>
              <s>Et quia
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              hic Cometa in vortice Y mediam tantùm partem iſtius
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              gyri, & multò minùs in vortice ſ, nunquamque in
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              ullo multò plus percurrit: idcirco tantùm per paucos
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              menſes in eodem vortice manere poteſt. </s>
              <s>Atque ſi
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              con­
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              ſideremus illum à nobis videri non poſſe, niſi quam­
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              diu eſt in illo vorticie prope cujus c entrum verſamur;
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              atque etiam non priùs ibi apparere, quàm b materia
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              alterius vorticis, ex quo venit, ipſum ſequi & circum­
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              fluere planè defierit: cognoſcemus quo pacto, quam­
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              vis idem Cometa maneat ſemper ejuſdem magnitudi­
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              nis & ferè ſemper aequè celeriter moveatur, debeat
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              tamen videri major & celerior, initio ſui curſûs appa­
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              rentis, quàm in fine; ac interdum in medio maximus
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              &scelerrimus putari. </s>
              <s>Nam ſi putemus oculum ſpecta­
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              toris eſſe prope centrum F, Cometa illi multò major
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              &scelerior apparebit in 3, ubi primùm videri incipiet,
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              quàm in 4 ubi deſinet: quia linea F 3 multò brevior </s>
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