Gassendi, Pierre, De motu impresso a motore translato epistulae duae, 1642

Table of figures

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              trogradatione, & directione Planetarum, quidpiam
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              colligatur ad ſtabiliendum Terræ quietem, vt po­
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              tiùs non ſit argumentum magis conſentaneum, quo
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              motus illi aſſeratur. </s>
              <s id="id.000908">Quæſo te enim quidnam poſſit
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              eſſe probabilius, quàm magna iſta corpora, globos, in­
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              quam, Planetarum, vno tenore incedere, & ſuam ſem­
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              per viam, ſeu prorſùm, antrorſumve ire? </s>
              <s id="id.000909">Ibunt porrô,
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              ſi Terra quidem inter ipſos media incedat, ac di­
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              recta eſſe nunquam deſinat: & quòd interdum ſta­
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              tionarij, retrogradique appareant, continget appa­
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              ritio ex commiſtione motus ipſius. </s>
              <s id="id.000910">Explicant hæc vul­
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              gò per Epicyclos, quorum centra circa Terram vno
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              tenore ſic ferantur; vt Planetæ interìm in ſuperfi­
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              ciebus Epicyclorum moti, ad ſuperiores quidem
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              parteis directi ſint, ad inferiores retrogradi, & in
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              medio deſcenſu, aſcenſuque, ſtationarij. </s>
              <s id="id.000911">At quan­
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              tum quæſo compendium, vt vnica Terra vnico inceſ­
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              ſu Epicyclos omneis faciat ſuperuacaneos, Planetas
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              illis eximat, alteróque motu abſoluat? </s>
              <s id="id.000912">Et de duobus
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              quidem Soli proximis, Mercurio, nempe, ac Venere,
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              vt primùm dicam; Quid eſt, cur Epicyclos fingant,
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              quorum centra contineantur inuariabiliter in linea à
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              Terra in Solem directa? </s>
              <s id="id.000913">Cur Planetarum remotio­
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              rum epicycli liberi ſunt; epicycli iſtorum duorum ad
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              Solem ita illigati? </s>
              <s id="id.000914">Cur ſaltem non eſt alter duorum
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              liber? </s>
              <s id="id.000915">Cur neuter horum Planetarum ad ſextilem
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              vſque aſpectum heinc inde à Sole diſcedit, ſed cùm
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              vix ſigno, aut ſeſqui-ſigno ſepoſitus eſt, ipſum repetit,
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              ſeu retrogradus ab ortu, ſeu directus ab occaſu? </s>
              <s id="id.000916">Cur
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              non proinde inſtar aliorum motibus ſuis nos circum-</s>
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