Borro, Girolamo
,
De motu gravium et levium
,
1575
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habent:
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ob rem corporum ſimplicium, quæ elementa voca
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tur, definitio per quietem data eorumdem definitioni per mo
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tum quauis ratione inuentæ, est omnino præferenda, quod
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Ariſtoteles tetigiſſe viſus eſt libro primo de cælo particula de
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cimaſeptima: vbi grauia, & leuia non per
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quietẽ
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, ſed per
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motũ
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pingui, et craſſa minerua ſe definiuiſſe teſtatur; donec per quie
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tẽ
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accuratius, ac diligentius elementorum natura diſputetur,
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quod quarto lib.de cælo præstitum fuiſſe nemo eſt qui neſciat.
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<
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">Quæ Themiſtius
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cõtra
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Ariſtotelem ſcripſit de gra
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uium, & leuium definitione. </
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<
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">Cap. XXIX.</
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">EXPLODENDVS
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est hoc loco Themiſtius, qui has
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grauium, & leuium definitiones per eorumdem
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motũ
">motum</
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,
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& quietem datas, rem quamlibet
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abbr
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definitã
">definitam</
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>
complecti non
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credidit; & multa, de quibus hæ definitiones dicuntur, quæ nec
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grauia ſunt nec leuia, ratus eſt inueniri: quod terra ſua ipſius
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natura ponderoſa, in aere ſuſpenſa deorſum non feratur, quæ
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tamen terra eſt & grauis: ergò non quodlibet graue deorſum
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tendit. </
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<
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">Quin etiam terra, dum in centro quieſcit, ibi ſtat im
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mota, & deorſum non citatur: cum locus centro inferior in na
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tura non detur, ad
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abbr
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quẽ
">quem</
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>
aliquod ponderoſum corpus deſcendat:
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terra ergò, quòd in centro stat immota, & deorſum non cita
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tur, est grauis: ſi graue id eſt, quod in centro quieſcit, & non
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deſcendit: ergò graue illud non est, quod deſcendit, ſed graue
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id eſt; quod stat immotum.
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Idem de leuissimo igni dicendum, qui apud nos genitus, &
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quo minus aſcendat ab aliquo impeditus, ad
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ſuperã
">ſuperam</
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>
huius infe
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rioris mundi
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="
orã
">oram</
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>
, vbi nunc luna eſt, non attollitur, & in ſuo pro
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prio naturalique loco exiſtens ſurſum altius non euolat: cum
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