Descartes, René, Renati Des-Cartes principia philosophiae

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="191"/>
                <arrow.to.target n="marg1192"/>
                <lb/>
              rectâ lineà quee tranſit per centra Cometae & Solis
                <lb/>
              interdum nonnihil ab eâ deflectens; ac denique in­
                <lb/>
              terdum latior, interdum anguſtior, vel etiam lucidior,
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              cùm nempe radii laterales verſùs oculum convergunt.
                <lb/>
                <arrow.to.target n="marg1193"/>
              Haec enim omnia ſequuntur ab irregularitate ſphae­
                <lb/>
              roidis DEFGH: quippe verſùs polos, ubi ejus figura
                <lb/>
              depreſſior eſt, caudas Cometarum exhibere debet ma­
                <lb/>
              gis rectas & latas; in flexu qui eſt inter polos & ecli­
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              pticam, magis curvas, & à Solis oppoſito deflectentes;
                <lb/>
                <arrow.to.target n="marg1194"/>
              &sſecundùm iſtius ſlexûs longèitudinem, magis luicidas
                <lb/>
              &sanguſtas. </s>
              <s>Nec puto quicquam hactenus circa Co­
                <lb/>
              metas fuiſſe obſervatum, ſaltem quod nec pro fabulâ,
                <lb/>
              nec pro miraculo ſit habendum, cujus cauſſa hîc non
                <lb/>
              habeatur. </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1190"/>
              CXXXVIII.
                <lb/>
              Cur Cometarum cauda, non ſemper in</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1191"/>
              30</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1192"/>
              parte à Sole directè
                <lb/>
              averſa, nec ſemper
                <lb/>
              rectâ videatur.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1193"/>
              5</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1194"/>
              10</s>
            </p>
            <p type="main">
              <s>
                <arrow.to.target n="marg1195"/>
                <lb/>
                <arrow.to.target n="marg1196"/>
              Quaeri tantùm poteſt, cur non etiam comae circa
                <lb/>
              ſtellas fixas, ac circa altiores planetas Jovem & Satur­
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              num appareant. </s>
              <s>Sed facilis reſponſio eſt. </s>
              <s>Primò, ex
                <lb/>
              eo quòd non ſoleant videri in Cometis, cùm eorum
                <lb/>
              diameter apparens non eſt major quàm fixarum, quia
                <lb/>
                <arrow.to.target n="marg1197"/>
              tunc iſti radii ſecundarii non habent ſatis virium ad
                <lb/>
              oculos movendos. </s>
              <s>Ac deinde, quantum ad fixas, quia
                <lb/>
              cùm lumen à Sole non mutuentur, ſed illud ex ſe ipſis
                <lb/>
              emittant, iſta earum coma, ſi quee ſit, hinc inde in om­
                <lb/>
              nes partes ſpargi debet, atque eite perbrevis; jamque
                <lb/>
                <arrow.to.target n="marg1198"/>
              revera circa ipſas talis coma eſſe videtur: neque enim
                <lb/>
              uniformi lineâ circumſcriptae, ſed vagis radiis undi­
                <lb/>
              que cinctae apparent; & non malè fortèan earum etiam
                <lb/>
              ſcintillationem (cujus tamen plures aliae cauſee eſſe
                <lb/>
              poſſunt) huc referemus. </s>
              <s>Quantum autem ad Jovem
                <lb/>
                <arrow.to.target n="marg1199"/>
              &sSaturnum, non dubito quin, ubi ae
                <gap/>
              r eſt admodum
                <lb/>
              purus, breves etiam interdum comae, in partem à Sole </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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