Gassendi, Pierre
,
De proportione qua gravia decidentia accelerantur
,
1646
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<
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">XXX. </
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<
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">Proſequeris deinde ſic.
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Porrò cùm celeritas
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motus in naturali deſcenſu grauium, non modò ad locum, ſed
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ad tempus quoque reſpectum includat, iamque de altero
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ſit, qua videlicet ratione, celeritas ſpatijs æqualibus augea
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tur; vt ne quid ad perfectam motus accelerati notitiam de
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ſit, neceſſarium eſt, vt de ſpatiis quoque, quæ temporibus
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æqualibus percurruntur, quam inter ſe rationem obſeruent,
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reliqua diſputatione inquiramus, & ex iiſdem quoque expe
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rientiis definiamus.
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</
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<
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"> Hoc iam loco, optimè Vir, agnoſ
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cere potes originem mali. </
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<
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">Nempe labes tota vide
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tur ex definitione vulgari contracta, quatenus ratio
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nem increſcentis celeritatis ita cum ſpatio comparat,
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vt nullam interim inſtituat comparationem cum tem
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pore, ſine quo tamen neque celeritas, neque acce
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leratio intelligi poteſt. </
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<
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">Non modò certè Ariſtoteles,
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verùm etiam communis ſenſus id Velox definit,
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quod ſpatium multum tempore pauco:
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& Tardum,
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quod
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paucum multò conficit;
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conſtatque aliunde, ſi velocitas
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attendatur ſolùm penes ſpatia, debere ſemper id
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mobile, quod decem percurrerit ſtadia, dici moueri
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celeriter, & ſemper id, quod vnicum percurrerit, tar
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dè; cùm contingere tamen poſſit, vt quod percurrit
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vnicum, moueatur decuplo velocius, quàm illud,
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quod percurrit decem. </
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<
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">Ex quo fit, vt cùm celeri
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tas nihil ſit aliud, quàm paſſio motus; intelligatur
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quidem motus abſolutè ſumptus ex relatione ad ſpa
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tium, cùm & definiatur progreſſio è loco in locum
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(nulla mentione temporis) & duo loca ſine ſpatio
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interiecto non accipiantur; at celeritas non intelli
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gatur ſine relatione ad tempus, & illud quidem breue </
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