Borro, Girolamo
,
De motu gravium et levium
,
1575
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<
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id eſt momentum, inclinationem,
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põdus
">pondus</
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, ſiue nutum; quo
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efficitur, vt grauia, & leuia corpora ſuſque, deque conciten
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tur: quod quamquam abſurdum omnino non eſt, nobis tamen
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ad has definitiones inueniendas vel parum quidem proderit;
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ideo hoc momentum,
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inclinationẽ
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, pondus, ſiue nutum pruden
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tes præterimus, & ad alia, quæ hanc noſtram cauſam magis
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iuuent omissis ambagibus properamus.
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<
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">Quomodo graue, & leue Plato definierit, & quo
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modo corpora ex figuris componi debere
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voluerit. </
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<
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">Cap. XVIII.</
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<
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">DIVINVS
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Plato in Timæo graue illud eſſe cenſuit,
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quod ægrè à ſuo loco mouetur, ſiue quod cum pluribus
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partibus eiuſdem generis, ſiue triangulis compluribus
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conſtet, difficile distrahitur: vt terra craſſa cum ſit, ex loco
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ad locum non niſi magno cum labore mouetur, & propter
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eamdem cauſam propria ſponte quieſcit. </
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">Contra verò le
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ue id est, quod paucis ex partibus eiuſdem generis, ſeu trian
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gulis coaugmentatur, vt ignis, & aer tenues exiſtunt, ideo
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que minimo negocio mouentur, & huc, atque illuc facilè
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pelluntur.
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Præterea Plato ſtatuit aerem, ignem, &
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aquã
">aquam</
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ex eiſdem
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partibus, ſeu triangulis constare, & inter ſe grauitate tan
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tum, & multitudine differe: quò fit, vt vnum illorum ſit le
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uius, alterum grauius: prout ex pluribus, aut ex paucioribus
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partibus, ſeu triangulis conflatur: Nec enim Plato diuinus
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putat ex locorum interuallis, vt Ariſtoteles haſce grauium,
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& leuium definitiones eſſe petendas, cum nihilin cælo verè ſu
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perum, nihil ibi verè inferum à Platone eſſe credatur, ſed
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