Gassendi, Pierre
,
De proportione qua gravia decidentia accelerantur
,
1646
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petus omnium globorum inter ſe æqualeis; ſed
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tempore impetus exprimitur à quarto ſemel, exprimi
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à tertio bis, à ſecundo ter, à primo quater, &c. </
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<
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arcuum CB, GB, IB, cum ipſis planis punctim
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notatis inter extrema eadem; tu ſic inſtas, vt licet
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totum id eſſe verum concederetur, quod dicitur de
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impetu globi per diuerſos arcus librati, vrgeas
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aliam
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eſſe rationem, aut meritò ſaltem videri poſſe aliam,
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deſ
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cendentis globi per diuerſa plana. </
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<
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lobus enim,
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in
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quis,
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per aërem ſemper toto ſuo pondere deorsùm nititur,
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& eatenus ſolum eius deſcenſus interturbatur, quatenus à
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recto, & perpendiculari curſu ad circularem cogitur, at
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que adducitur: at præter impedimentum ex varia plano
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rum inclinatione, adhûc maius, dum globus etiam magis
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à perpendiculari deſcenſu diſtrahitur; tantò minoribus in
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ſuper momentis globus per planum deſcendit, quan ò mi
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nùs accliue fuerit, vt facilè omnibus notum eſt.
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<
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non video quî id concludas; quatenùs non aſſumis
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planum, quantò minùs decliue eſt, tantò eſſe quo
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que prolixius. </
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<
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">Etenim notum quidem eſt acquiri
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minores velocitatis gradus in minus decliui, quod
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ſit decliuiori æquale, at, ſi vt minùs decliue, ita etiam
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prolixius ſit, notum quoque eſt velocitatem in fine
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illius quæſitam eſſe poſſe æqualem velocitati in fine
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decliuioris acquiſitæ, prolixitate nempe deſcenſus par
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uitatem incrementorum velocitatis compenſante.
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<
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">Interim autem æqualitas impetus in B acquiſiti, ſiue
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per arcum, ſiue per planum contingat globi delapſio,
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ex eo videtur conſequi, quòd ſilum ſupernè globum </
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