Gassendi, Pierre
,
De motu impresso a motore translato epistulae duae
,
1642
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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. </
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<
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">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. </
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<
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id
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">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. </
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">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. </
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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. </
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<
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">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. </
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<
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">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 </
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