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

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              <s id="id.000932">
                <pb pagenum="146" xlink:href="027/01/145.jpg"/>
              ſi conſiſtere; ac deinceps quoque retrogredi, quo­
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              niam ipſa velocius pergens, illos à tergo ſensim
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              facit; adeò vt retrogreſſio maxima appareat, cùm
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              proxima eſt, illoſque è regione habet; ac poſteà
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              appareat paulatìm decreſcere, quovſque, dum diſ­
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              cedit ab ipſis ſecundum rectam quaſi lineam, vi­
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              dentur rurſùm quaſi ſtare. </s>
              <s id="id.000933">Poſt ſecundam autem
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              ſtationem apparent, vt priùs, directè, & magis,
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              magiſque velociter incedere; quia deinceps Terra,
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              vt vltra Solem tranſitura, obſeruat illos progredien­
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              teis iuxta ſignorum ſeriem; qui in ſitu oppoſito vi­
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              debantur contra eandem ſeriem ire. </s>
              <s id="id.000934">Heinc ergo eſt,
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              quare non poſſint apparere retrogradi, niſi in op­
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              poſitione cum Sole, ſiue Terra exſiſtente interpo­
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              ſita; neque non poſſint non apparere, ob velocio­
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              rem Terræ motum. </s>
              <s id="id.000935">Heinc, quare epicyclus Martis
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              videatur major epicyclo Iouis; quia videlicet ob
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              majorem illius propinquitatem, retrogradatio in ip­
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              ſo apparere propiùs incipit, & deſinit longiùs. </s>
              <s id="id.000936">Heinc,
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              quare tunc Mars adeò magnus appareat, qui aliàs
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              adeò paruus eſt; ſcilicet quià Terra eſt illi tam pro­
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              pè, quæ aliàs tam procùl incedit; octo, vt putà, vi­
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              cibus remotiùs. </s>
              <s id="id.000937">Heinc quare Mars, non-niſi bien­
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              nio ſemel retrogradus ſit; quippe quia, Terra non in­
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              cedens, niſi duplò velociùs, non poteſt illum aſſe­
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              qui, niſi duplò temporis, quo periodum ipſa ab­
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              ſoluit. </s>
              <s id="id.000938">Quare Iupiter quotannis percurrat, retrogra­
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              duſque efficiatur, idque vno ſolùm menſe tardiùs;
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              quia Terra nempe velocior eſt duodecuplò, illum­
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              que ſemel relictum aſſequitur ſemper decimo tertio </s>
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        </body>
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