Descartes, René, Renati Des-Cartes principia philosophiae

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                <pb pagenum="190"/>
              dem ex parte, rectà pergant uſque ad 3, ſed tamen etiam
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              nonnulli ex ipſis hinc inde ſpargantur; & qui obliquè
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              incidunt in G, non tantùm rectà pergant verſus 4, ſed
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              etiam ex parte refrangantur verſus 3; & denique qui
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              incidunt in H, rectà non perveniant ad orbitam Terrae,
                <arrow.to.target n="marg1184"/>
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              ſed tantùm reflexi verſùs 4 & 5, ſicque de caeteris. </s>
              <s>
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              Unde patet, ſi Terra ſit in orbitae ſuae parte 3, hunc
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              Cometam ex eâ viſum iri cum comâ in omnes partes
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              diſperſâ; quod genus Cometae Roſam vocant: radii
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              enim directi à C ad 3, ejus caput; alii
                <arrow.to.target n="marg1185"/>
              debi­
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              liores, qui ex E & G verſùs 3 reflectuntur, ejus crines
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              exhibebunt. </s>
              <s>Si verò Terra ſit in 4, idem Cometa ex eâ
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              videbitur per radios rectos CG4, & ejus coma, ſive
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              potiùs cauda, verſùs unam tantùm partem protenſa,
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              per radios ex H & aliis locis, quae ſunt inter G & H,
                <arrow.to.target n="marg1186"/>
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              verſùs 4 reflexos. </s>
              <s>Eodemque modo, ſi Terra ſit in 2,
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              Cometa ex eâ videbitur ope radiorum rectorum C E 2,
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              &sejus coma ope obliquorum qui ſunt inter C E 2 &
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              C D 2, nec alia erit differential niſi quòd, oculo exi­
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              ſtente in 2, Cometa mane videbitur, & coma
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              praecedet; oculo autem exiſtente in 4, Cometa vide­
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              bitur veſperi, & caudam ſuam poſt ſe trahet. </s>
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            <p type="margin">
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              CXXXVI.
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              Explicatio apparitio­
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              nis comoe.</s>
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              <s>
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              25</s>
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              <s>
                <margin.target id="marg1177"/>
              30</s>
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                <margin.target id="marg1178"/>
              5</s>
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              <s>
                <margin.target id="marg1179"/>
              10</s>
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                <margin.target id="marg1180"/>
              15</s>
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              <s>
                <margin.target id="marg1181"/>
              20</s>
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            <p type="margin">
              <s>
                <margin.target id="marg1182"/>
              25</s>
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              <s>
                <margin.target id="marg1183"/>
              30</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1184"/>
              5</s>
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            <p type="margin">
              <s>
                <margin.target id="marg1185"/>
              10</s>
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            <p type="margin">
              <s>
                <margin.target id="marg1186"/>
              15</s>
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            <p type="margin">
              <s>
                <margin.target id="marg1187"/>
              20</s>
            </p>
            <figure id="fig51" number="52"/>
            <p type="main">
              <s>
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              Denique, ſi oculus ſit verſùs punctum S, impedietur
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              à radiis Solis ne Cometam ipſum videre poſſit, ſed
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              videbit tantùm ejus comae partem, inſtar igneae trabis,
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              quae apparebit vel veſperi vel mane, prout oculus pro­
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              pior erit puncto 4 vel puncto 2; atque fortè una mane
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              &salia veſperi poterit apparere, ſi oculus in ipſo pun­
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              cto medio 5 exſiſtat. </s>
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            <p type="margin">
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              CXXXVII.
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              Quomodo etiam trabes
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              appareant. </s>
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              25</s>
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              Et quidem haec coma vel cauda interdum
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              in­
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              terdum nonnihil incurva eſſe debet; interdumque in </s>
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