Descartes, René, Renati Des-Cartes principia philosophiae

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          <chap>
            <p type="main">
              <s>
                <pb pagenum="170"/>
              quin ea quae jam verſatur in O, pergendo per R ad Q,
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              detrudat hoc ſidus ſecundùm lineam rectam verſùs S:
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              atque ex naturâ gravitatis infrà a explicandâ, intellige­
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              tur iſtum motum ſideris N, alteriuſve cujuſvis corpo­
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              ris, verſùs centrum vorticis in quo verſatur, dici
                <arrow.to.target n="marg1076"/>
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              ejus deſcenſum. </s>
              <s>Sic, inquam, ipſum detrudit initio,
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              cum nondum intelligimus in eo eſſe alium motum;
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              ſed ſtatim etiam illud circumquaque ambiendo, ſecum
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              defert motu circulari ab N verſùs A cùmque hic mo­
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              tus circularis ei det vim recedendi à centro S,
                <arrow.to.target n="marg1077"/>
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              tantùm ab ejus ſoliditate, ut vel multùm deſcendat
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              verſus S, nempe ſi perexigua ſit ejus ſoliditas; vel con­
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              trà, ſi magna ſit, ab S recedat. </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1075"/>
              5</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1076"/>
              5</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1077"/>
              10</s>
            </p>
            <figure id="fig44" number="45"/>
            <p type="main">
              <s>
                <arrow.to.target n="marg1078"/>
                <lb/>
              Per ſoliditatem hic intelligo quantitatem materiae
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              tertii elementi, ex quâ maculae hoc ſidus
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              componuntur, cum ejus mole & ſuperficie compara­
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              tam. </s>
              <s>Quippe vis, quâ materia vorticis AEIO id defert
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              circulariter circa centrum S, aeſtimanda eſt à magnitu­
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              dine ſuperficiei, ſecundùm quam ipſi occurrit; quia quò
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              major eſt iſta ſuperficies, eo plus materiae in hoc agit.
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                <arrow.to.target n="marg1080"/>
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              Vis autem, quâ iſta materia verſùs idem centrum S
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              ipſum pellit, aeſtimanda eſt à magnitudine ſpatii quod
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              ab eo occupatur. </s>
              <s>Quamvis enim omnis illa materia,
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              quae eſt in vortice AEIO, conetur recedere ab S, non
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              tamen omnis agit in ſidus N, ſed tantùm ea ejus pars,
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              quae reipſâ inde recedit, cùm hoc accedit; haecque eſt
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              aequalis ſpatio quod ab eo fuit occupatum. </s>
              <s>Denique
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              vis quam idem ſidus N à proprio ſuo motu acquirit ad
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              perſeverandum in eodem illo motu, quam ipſius agita­
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              tionem voco non aeſtimanda eſt ab ejus ſuperficie,
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              </s>
            </p>
          </chap>
        </body>
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