Cardano, Girolamo
,
De subtilitate
,
1663
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<
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417
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partem vnius aſſume, quas addes diſtantiæ
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a Fortunatis loci tabularum Alphonſi, ſi lo
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cus Lunæ inſtrumento inuentus poſterior
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fuerit, id eſt, magis ab initio Arietis de
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ſtiterit loco inuento per tabulas: aut mi
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nues ab eodem, vbilocus tabularum partes
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& minuta, eo qui per inſtrumentum inuen
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tus eſt, plura obtineat, & quod relinquitur
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aut cogitur, eſt longitudo a Fortunatis loci
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incogniti, quàm in ſphæra regionum ſimul
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cum latitudine quæres, noſcéſque vbi lo
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corum ſis, quibúſque ventis in patriam re
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gredi liceat: quod cùm ignorent, qui hiſto
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riam Indicarum rerum ſcribunt, latitudine
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appoſita longitudines locorum omittunt.
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</
s
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<
s
id
="
s.002791
">Nam quòd declinatione curſus Solis, qui
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cunque Indiam vtramque petunt, multùm
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adiuuentur, nec non & ſtellarum, omnibus
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qui cum Luſitanis ac Hiſpanis verſantur eius
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nauigationis gnaris, compertum eſt. </
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<
s
id
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s.002792
">Iam ve
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rò an vnus ſit mundus, an plures, an infini
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ti, an infinitus vnus, & an aliquid extra ip
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ſum, & an æternus, vel genitus, dictum
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eſt in libris de Æternitatis arcanis: nunc
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verò de Luce & Lumine, quæ ab aſtris pro
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fluunt, dicemus. </
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Regiones in
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cognitæ, diſ
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perſæque
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expan
abbr
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tẽ-peſtatibus
">tem
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peſtatibus</
expan
>
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naues, quo
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pacto vbi
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ſint, dignoſci
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poſſint.</
s
>
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id
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<
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type
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LIBER QVARTVS,
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<
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<
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De Luce & Lumine.
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type
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"/>
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</
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</
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type
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<
s
id
="
s.002796
">
<
margin.target
id
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marg308
"/>
Aſtra omnia
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habere
<
expan
abbr
="
lumẽ
">lumen</
expan
>
,
<
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& vmbram.</
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>
</
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<
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type
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main
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<
s
id
="
s.002797
">HABENT omnia ſydera lumen,
<
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motum, ac magnitudinem
<
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propriam: & vt lumen minùs
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à maiore tegitur, ſic vmbra
<
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latet. </
s
>
<
s
id
="
s.002798
">Luna in die vmbram
<
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non facit, noctu fecit. </
s
>
<
s
id
="
s.002799
">Si Luna luceat,
<
lb
/>
aſtrorum reliquorum vmbras non videbis:
<
lb
/>
vbi illa delituerit, quorundam quandoque
<
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/>
adeò vmbram videbis exquiſitam, vt Ve
<
lb
/>
neris ego lumen per feneſtram ingrediens,
<
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Lunæ eſſe arbitrarer. </
s
>
<
s
id
="
s.002800
">Vnaquæque igitur
<
lb
/>
ſtella proprium habet lumen, cùm propriam
<
arrow.to.target
n
="
marg309
"/>
<
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/>
habeat lucem: quo ſit vt ex frequentibus
<
lb
/>
ſyderibus lumen miſcentibus, lacteus cir
<
lb
/>
culus ab oculo æſtimetur. </
s
>
<
s
id
="
s.002801
">Adiuuat hoc cœ
<
lb
/>
li ſubſtantia denſa, & ſyderum rara, velut
<
lb
/>
in Cometa, qui caudam, aut crines habet:
<
lb
/>
nam cùm nunquam mutetur, conſtat ipſum
<
lb
/>
in cœlo eſſe, non infra. </
s
>
<
s
id
="
s.002802
">Sed quomodo radij
<
lb
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per inane tranſeuntes refracti videntur,
<
lb
/>
cùm Solis radij in aëre viſui
<
expan
abbr
="
nõ
">non</
expan
>
ſubiiciantur.
<
lb
/>
<
arrow.to.target
n
="
marg310
"/>
<
lb
/>
Hæc eadem eſt cauſa, cur etiam vbi refle
<
lb
/>
xio radiorum in terra eſt, vt in vallibus,
<
lb
/>
longè maior ſit calor: nam ſi radius pene
<
lb
/>
trat, vnus tantùm eſt: cùm reflectitur, duo:
<
lb
/>
cùm iterùm reflectitur, tres radij in eodem
<
lb
/>
ſunt loco, quare calor magnus hîc procrea
<
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/>
tur: in lactea autem via non his, aut ter,
<
lb
/>
ſed tum ob propinquitatem ſtellarum, tum
<
lb
/>
ob denſitatem millies reflectuntur, cùm
<
lb
/>
etiam plurimæ ſint: igitur in medio cando
<
lb
/>
rem, vt lactis fieri neceſſe eſt, quod ego
<
lb
/>
etiam multis cum candelis caſu imitari pul
<
lb
/>
cherrimè vidi, vt euidenti rationi etiam
<
lb
/>
<
arrow.to.target
n
="
marg311
"/>
<
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experimentum ſubſcribat. </
s
>
<
s
id
="
s.002803
">Atque eadem ra
<
lb
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tione ignis in cauis ſpeculis accenditur,
<
lb
/>
quoniam in paruum ſpatium radij plurimi
<
lb
/>
coëunt, non tamen in candida materia,
<
lb
/>
quia rationem tollit, qua accendere poſſunt:
<
lb
/>
poſſunt enim, quia coëunt, ac candidum
<
lb
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diſſipat, & ſeparat. </
s
>
<
s
id
="
s.002804
">Ob hoc ab igne candi
<
lb
/>
da tela facilè vritur, imò à ſcintilla, à ſpe
<
lb
/>
culi concaui ſolaribus radiis non vritur.
<
lb
/>
</
s
>
<
s
id
="
s.002805
">Eadem ratio ad vnguem eſt in ſphærula
<
lb
/>
cryſtalli, & rotunda amphora vitrea aqua
<
lb
/>
plena. </
s
>
<
s
id
="
s.002806
">Sed vt in his radij ex aduerſo coëunt,
<
lb
/>
ita in cauis ſpeculis antè: verùm vrendi, &
<
lb
/>
<
arrow.to.target
n
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non vrendi par ratio in vtriſque. </
s
>
<
s
id
="
s.002807
">Cùm enim
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lb
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rem candidam ſubieceris, conus ille mani
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lb
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feſtè dilatatur, & ideò vrere non poteſt.
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lb
/>
</
s
>
<
s
id
="
s.002808
">Hoc autem quòd dilatetur, oculo etiam de
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præhenditur. </
s
>
<
s
id
="
s.002809
">Sed cur lumen coactum hæc
<
lb
/>
inferiora maximè Solis calefacit, cùm Sol
<
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<
arrow.to.target
n
="
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"/>
<
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calidus non exiſtimetur? </
s
>
<
s
id
="
s.002810
">Verùm ego cali
<
lb
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dum eſſe Solem ponere non vererer, cùm
<
lb
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nihil calidum aliud eo caloris genere exi
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ſtimem: hoc enim ſuperiùs oſtenſum eſt.
<
lb
/>
</
s
>
<
s
id
="
s.002811
">Nam putridus calor, & igneus non gene
<
lb
/>
rat, ſed corrumpit: Solis calor, & ſyde
<
lb
/>
rum generat. </
s
>
<
s
id
="
s.002812
">Calor autem rerum, quæ vita
<
lb
/>
carent nullus actu eſt, nec ſenſu tactus per
<
lb
/>
cipi poteſt. </
s
>
<
s
id
="
s.002813
">Solis calor tactui ſubiicitur.
<
lb
/>
</
s
>
<
s
id
="
s.002814
">Sed nec animantium calor talis eſt, cùm
<
lb
/>
pabulo indigeat, ſyderum calor minimè.
<
lb
/>
</
s
>
<
s
id
="
s.002815
">Sed ſi velis placita Ariſtotelis tueri, dices
<
lb
/>
quòd aër & aqua dum lumen illud excipe
<
lb
/>
re conantur naturali quadam facultate, qua
<
lb
/>
grauia deſcendunt, leuia aſcendunt, mo
<
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uentur ac diſſipantur. </
s
>
<
s
id
="
s.002816
">Calor quoque, qui
<
lb
/>
in eis iam potentia erat, ſuſcitatur, & ad
<
lb
/>
actum perducitur. </
s
>
<
s
id
="
s.002817
">Aqua verò ab aëre inca
<
lb
/>
leſcit, qui eſt ſeipſa calorem non habet:
<
lb
/>
proptereà ſuperficies ſumma, aut ſolùm
<
lb
/>
calida eſt, aut maximè. </
s
>
<
s
id
="
s.002818
">Motum hunc ra
<
lb
/>
ritas conſequitur, raritatem calor: hoc enim
<
lb
/>
ſuperiùs, quomodo fiat, oſtenſum eſt. </
s
>
<
s
id
="
s.002819
">Ca
<
lb
/>
<
arrow.to.target
n
="
marg314
"/>
<
lb
/>
lor enim, motus, ac tenuitas circulo quo
<
lb
/>
dam mutuò ſibi cauſæ ſunt: nam ſubtilitas,
<
lb
/>
caloris cauſa eſt: calor dum depaſcitur, mo
<
lb
/>
tus: at motus ipſe ſubtilitatis rurſus cauſa
<
lb
/>
eſt: motus enim collidendo partes attenuat.
<
lb
/>
</
s
>
<
s
id
="
s.002820
">Subſtantia tenuis, quia magnam vim exci
<
lb
/>
pit radij, calida euadit, calidum verò at
<
lb
/>
trahendo, & diſcutiendo motum cit: quæ
<
lb
/>
viciſſitudo in animalibus vitam præbet,
<
lb
/>
& manifeſtiſſima eſt. </
s
>
<
s
id
="
s.002821
">Suprà enim docuimus,
<
lb
/>
frigidum nihil aliud eſſe, quàm quòd calo
<
lb
/>
re caret, nec recipit: rarum igitur admo
<
lb
/>
dum frigidum eſſe, eſt impoſſibile, videtur
<
lb
/>
igitur ipſe radius, ſeu lumen caloris ſubſtan
<
lb
/>
tia, hocque nobis ſufficeret, qui eatenùs ſo
<
lb
/>
lùm rationes ſectamur rerum, quatenus iu-</
s
>
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