Borro, Girolamo
,
De motu gravium et levium
,
1575
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011/01/076.jpg
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Terra it aque vbi cum que ſit, est terra, & grauis, ſiue mo
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ueatur, ſiue quieſcat, & ignis in quocumque loco inueniatur
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est ignis, & leuis, ſiue aſcendat, ſiue non; de quorum vtroque
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elemento, veraque grauium, & leuium definitio eatenus dici
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tur quo ad vtrum que elementum, seu graue, seu leue, ſolam
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energiam, & ſolam innatam propenſionem ad motum ad lo
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cum, & ad quietem in loco habet; ſiue ad centrum, ſiue in cen
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tro, ſiue ad lunæ concauum, ſiue ſub lunæ concauo. </
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<
s
id
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s.000421
">Porrò ab
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eadem naturali vtriuſque grauis, & leuis corporis forma, hæc
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innata propenſio ad motum naſcitur, à qua quies in proprio
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naturalique eorumdem loco exoritur. </
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<
s
id
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s.000422
">Explodenda eſt ergo in
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hac parte falſa Themiſtij ſententia, & vera Ariſtotelis est
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omnino probanda.
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Ad confirmationem noſtram, quam pro Themictij parte
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adduximus, reſpondemus. </
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<
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id
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">Terræ vaſtissima, & grauissima
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moles ſuæ naturæ derelicta, ad centrum lata, ſi nihil ibi of
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fendat, quod illius motum impediat, infra centrum ſuo nixu
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non feretur, ſed quieſcet; nec vltra promoueri poterit,
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abbr
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nõ
">non</
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pro
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pter radices infinitas, quas in parte in feriore habeat, vt Ze
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nophanes Colophonius affirmauit. </
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<
s
id
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s.000425
">Non propter aquam ſubie
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ctam, vt Tales mileſius; Non propter aerem suppoſitum vt
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Anaxagoras, at que Democritus crediderunt: à quibus, aqua
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ſcilicet atque aere lata terræ figura subſtentaretur. </
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<
s
id
="
s.000426
">Non pro
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pter ocissimam cæli conuerſionem, vt Empedocles tradidit:
<
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nõ
">non</
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propter æquabilitatem, vt Anaximander docuit; sed quia
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ſic ſtatutum eſt à natura, vt corpora omnia grauia vndecum
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que deorſum ferantur ad totius mundi centrum descendat, il
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ludque pertranſire non possint; sed ibi quieſcant: alioqui con
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tranaturam propriam iterum in sublime volabunt: omnes
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enim totius mundi partes, vbicumque extra centrum extite-
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