Biancani, Giuseppe
,
Aristotelis loca mathematica
,
1615
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242
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ſpectemus, eas falcatas, ac lunulatas, videamus; non autem, vt ſolemus,
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rotundas. </
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">Reſpondet, id fortè accidere, quia lux per foramen intrans, fit
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conus natura ſua, vt in 5. problemate pręcedenti, explicatum eſt. </
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<
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">& in præ
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ſenti figura conus lucis intrantis per foramen E, figuratur à lineis E F, E H,
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quibus ſimiles alias plurimas debemus concipere ab E, ad circularem ba
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ſim F G L I, quæ turbinem perfectum efficiunt. </
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<
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id
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">alius præterea conus eſt à fo
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ramine ad Solem, cuius baſis eſt A B C P, circulus Solis: & continetur ſub
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infinitis radijs, quorum duo ſunt A E, C E;
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; autem habet verticem ad
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E, quia igitur plures radij ſuperioris coni deficiunt, ideò etiam in inferiori
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deficient:
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eritq́
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; ſitus eorum inuerſus ob radiorum interſectionem ad pun
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ctum E,
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; ſplendor in tabella apparens lunulatus, quia ex parte Solis
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pariter lunulata producitur. </
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<
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Ex Sectione 16.
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351</
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<
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">In 1. problema
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(Cur baſes bullarum in aquis ſunt albæ; & ſi in Sole ponan
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tur, non faciunt vmbram; ſed bullæ reliquum vmbram facit, baſis verò non
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facit, ſed circulariter à Sole illuminatur. </
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<
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">quod verò mirabilius eſt, quod
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neq;
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ſi quodpiam lignum in aquam inferatur in Sole, hæc ſub aqua diuiduntur.
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">An non fit vmbra, ſed à Sole diſſipatur vmbra? </
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<
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">fi igitur vmbra est non inſpectum,
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& à Sole circulariter inſpicitur moles: hoc verò impoſſibile eſſe oſtenditur in Op
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ticis. </
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enim minimum, à maximo totum conſpici poteſt)
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Cùm ex ipſius textus
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verbis ſatis perſpicuè appareat, quid proponatur, reliqua ſic breuiter ex
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ponam. </
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<
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">quod igitur de ligno ait, exiſtimo hoc modo
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accipiendũ
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, vt lignum
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illud in aqua ponatur ſub bulla, ita vt vmbra bullæ cadat ſuper ipſum,
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;
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vmbra illius ſimiliter apparebit defectiua, quia baſis illuminatio ipſam ex
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parte deſtruet. </
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<
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id
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">Reſpondet, An non fit vmbra, ſed à Sole vmbra fugatur?
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</
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<
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">quæ verba ſubobſcura ſunt;
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reſponſio videtur allata ad ſoluendum pro
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blema, ſed ad eum magis confirmandum. </
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<
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id
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">deinde ait: ſi igitur nihil aliud eſt
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vmbra, quam id, quod non aſpicitur à Sole, & à Sole tamen videamus illu
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minari totam bullæ baſim circulariter, neceſſe eſt totam etiam bullam
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vn-diq;
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dique</
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à Sole illuminari, & conſpici, quod tamen impoſſibile eſſe demonſtra
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tur ab opticis: ipſi enim demonſtrant, nullum corpus, quantumuis mini
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mum, totum poſſe circumſpici à quamuis maximo illuminante. </
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<
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">quod qui
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dem antiquitus demonſtrauit Ariſtarchus Samius in libello de diſtantijs So
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lis, & Lunæ: &
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poſtea Vitellio
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lib. 2. propoſ. </
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<
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& ex figura præ
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ſenti facilè eſt id
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intelligere:
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n qua
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ſit Sol ſphæra A,
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illuminans ſphæ
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rulam B, extre
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mi radij DF, </
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