Descartes, René, Renati Des-Cartes principia philosophiae

Table of figures

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              quantulum diſtat ab iſto centro. </s>
              <s>Itemque, radii ab Y
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              ad terram venientes, tranſeundo per vorticem A E V,
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              nihil in eo ſuarum virium amittunt, niſi ratione di­
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              ſtantiae; non enim eorum vim magis minuit materia
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              hujus vorticis, ex eo quòd ab F recedere conetur,
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              verſùs partem ſuae circumferentae VX, quàm auget
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              ex eo quòd etiam tendat ab F verſus aliam partem
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              circumferentiae AE: atque ita de caeteris. </s>
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              CXXX.
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              Quomodo fixarum lu­
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              men ad Terram uſ­
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              que perveniat.</s>
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              15</s>
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              20</s>
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              25</s>
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              30</s>
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              5</s>
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              5</s>
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            <figure id="fig48" number="49"/>
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              Hîcque obiter eſt advertendum, radios ab Y ad ter­
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              ram venientes, obliquè incidere in lineas AE & VX,
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              quae deſignant ſuperficies, in quibus vortices iſti ter­
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              minantur, & ideò in ipſis refringi. </s>
              <s>Unde ſeguitur, ſtel­
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              las fixas non videri omnes ex terrâ, tanquam in locis
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              in quibus revera exſiſtunt, ſed tanquam ſi eſſent in
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              locis ſuperficiei vorticis AEIO, per quae tranſeunt
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              earum radii, qui perveniunt ad terram, ſive ad vici­
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              niam Solis; ac fortè etiam unam & eandem ſtellam in
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              duobus aut pluribus ejuſmodi locis apparere. </s>
              <s>Quae
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              loca cùm non deprehendantur fuiſſe mutata, ex quo
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              ab Aſtronomis notata ſunt, non puto aliud
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              iſtas ſuperficies per nomen -firmamenti eſſe intelli­
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              gendum. </s>
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              CXXXI.
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              An Fixae in veris locis
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              videantur: & quid ſit
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              Firmamentum. </s>
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              10</s>
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              15</s>
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              20</s>
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              Cometarum autem lumen, cùm ſit multò debilius
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              quàm Fixarum, non ſatis habet virium ad oculos no­
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              ſtros movendos, niſi ſub angulo ſatis
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              videan­
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              tur & ideò ratione diſtantiae non apparent, cùm à coelo
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              noſtro ſunt nimis remoti; notum enim eſt, quò magis
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              aliquod corpus à nobis remotum eſt, eò ſub minori
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              angulo videri. </s>
              <s>Cùm autem ad ipſum propiùs acce­
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              dunt, variae eſſe poſſunt rationes, ob quas
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              in illud ingrediantur, conſpicui non ſint: quarum </s>
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