Benedetti, Giovanni Battista de
,
Io. Baptistae Benedicti ... Diversarvm specvlationvm mathematicarum, et physicarum liber : quarum seriem sequens pagina indicabit ; [annotated and critiqued by Guidobaldo Del Monte]
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413
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EPISTOL AE.
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425
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0425
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/163127KK/pageimg/0425
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rerrogas, ſcito
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coniunxiſſe
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cum
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denſitate, &
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type
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<
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type
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raritate,
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vt ſup. diximus, ita vt cum aliquod corpus
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,
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type
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, & dum rarefit ma-
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iorem caliditatem acquirat, & ſic econtra fit, vt quanto magis aliquod corpus refri
<
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geratur, tanto denſius reddatur, & quanto calidius fit tanto rarius efficiatur. </
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>
<
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xml:space
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">Quo-
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lb
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ties igitur agitabitur aer, aut aliud corpus, quod ratione ſuæ ſubtilitatis, velociter
<
lb
/>
condenſari, & rarefieri poſſit, eius partes denſiores ſemper erunt frigidæ, & hanc
<
lb
/>
obrem quilibet ventus, qui per calida loca non tranſeat, natura ſua frigidus, calidus
<
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autem per accidens erit. </
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>
<
s
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xml:space
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">Hinc fit vt vaſa vitrea, & terrea tam in vehementi frigore,
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quam in magno æſtu frangantur, quia horum vnum fit, ne aliquis locus vacuus rema
<
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neat, & aliud ob loci neceſſitatem, ſed hoc non ſequeretur, ſi in materia, qua huiuſ
<
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modi vas conſtat, aliqua aeris portio non contineretur.</
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<
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xml:space
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">DE LVMINE LVNÆ, DE FINE LVMINIS,
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de fine motus corporum cęleſtium, de albedine,
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de ſphæra.</
head
>
<
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style
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">Clariβimo Antonio Nauaiero.</
head
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<
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Lunæ etiam ſi ſit lumen reflexum Solis ab ipſa Luna, ab ea tamen
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non ita reflectitur, vt à ſuperficie polita ſpeculi,
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eius luminis
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quan titatem
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type
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titatem</
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ſuper ipſum corpus lunare videamus, & eo modo
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quo
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conſpicimus. per ſe lumen, cauſa oculi eſt effectum, per accidens autem
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puta quod vis. </
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<
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">Terra deinde nunquam lunari lumine (
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ſolaris reflexio exiſtat)
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omnino deſtituta eſt, dico etiam, neque in ipſis ecclipſibus ſolaribus vel lunaribus,
<
lb
/>
in ſolaribus enim cum Soltot millia vices maior ſit Luna, Luna verò minor terra, ſe
<
lb
/>
quitur, vt terra non omnino priuata remancat lumine Lunæ, in ecclipſibus ve-
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rò lunaribus Luna ſemper videtur, gratia luminis ſolaris, quamuis refracti. </
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">Mo-
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tus corporum cœleſtium fit ratione ſitus, & varietatis virtutis ſtellæ in diuerſis locis,
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hæc autem varietas abſque diuerſo ſitu eiuſdem ſtellæ, nec diuerſus hic ſitus abſque
<
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/>
motu fieri poſſet, ita vt motus ſtellarum ſit ratione diuerſitatis ſituum ipſarum, er-
<
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go motus, & diuerſitas ſituum, fit, ob diuerſam influentiam. </
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<
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xml:space
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">Quæ autem de albe-
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dine fratri tuo dixeram, erant, quod inter
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colores albedo, certo quodam modò,
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ſimilitudinem habet cum lumine. </
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ne. </
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xml:space
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">Tertiò quia abſque reſiſtentia magis reci-
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pit qualitatem aliorum colorum, quam alij colores. </
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<
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xml:space
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">Quartò quia maximus
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eſt omnium colorum. </
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xml:space
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">Quintò quia ſimplicior eſt reliquis. </
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<
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xml:space
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">Sextò quia diſgregat vi-
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ſum. </
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<
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xml:space
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">Septimò quia qualitas quæ in niue alba eſſe videtur, nihil aliud eſt quam mul-
<
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/>
titudo quædam luminum reflexorum, & non albedo, ſimilis ei, quæ eſt lactis, aut
<
lb
/>
panni, quæ quidem ſeptima cauſa effecit, vt ipſam albedinem, magis quam alium
<
lb
/>
quemuis colorem cum ipſo lumine compararem, cum nihil ſit, quod eſſe ſuum
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<
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mutans, aut apparenter, aut eſſentialiter, illud ipſum prius non tranſmutet in for-
<
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mam ſibi propin quiorem, vt manifeſtè patet. </
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<
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xml:space
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">Eſt etiam huius rei octaua ratio,
<
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magni ponderis, quia ſcilicet nullus ſit color, qui magis reſiſtat lumini, aut in quem
<
lb
/>
lumen minorem impreſſionem faciat, quam albedo. </
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<
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xml:space
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">Vnde ſequitur, obiecta alba,
<
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minus eſſe combuſtibilia quam alia, cum quælibetres in ſuum contrarium quam in </
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