Biancani, Giuseppe
,
Aristotelis loca mathematica
,
1615
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128
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xlink:href
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head
">
<
s
id
="
s.002189
">
<
emph
type
="
italics
"/>
Problema Primum.
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emph.end
type
="
italics
"/>
</
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</
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<
p
type
="
head
">
<
s
id
="
s.002190
">Cur oriente, aut occumbente Sole, Iris ſemicirculus eſt?</
s
>
</
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>
<
p
type
="
main
">
<
s
id
="
s.002191
">Cauſa huius hæc eſt; ſupra enim dictum eſt, in omni Iridis appari
<
lb
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tione tria hæc, Solem, oculum, & Iridis centrum eſſe in eadem re
<
lb
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cta linea, v. g. in linea A C D, præcedentis figuræ, cum igitur Sol
<
lb
/>
tam oriens, quam occidens ſit in horizonte, v. g. in A, horizontis
<
lb
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puncto, ſimiliter oculus ſit in C, horizontis centro, conſectarium eſt, cen
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lb
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trum etiam Iridis D, eſſe pariter in horizontis ſuperficie, quare ſecabitur
<
lb
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ab horizonte per centrum, vnde etiam ſequitur ipſius Iridis portionem
<
lb
/>
E B F, quæ ſupra horizontem extat eſſe ſemicirculum. </
s
>
<
s
id
="
s.002192
">Quod ſi horizon non
<
lb
/>
obſtaret,
<
expan
abbr
="
integrũ
">integrum</
expan
>
Iris compleret orbem,
<
expan
abbr
="
cernereturq́
">cernereturque</
expan
>
; toto ambitu B F M E.</
s
>
</
p
>
<
p
type
="
head
">
<
s
id
="
s.002193
">An
<
expan
abbr
="
quandoq́
">quandoque</
expan
>
; maior ſemicirculo appareat?</
s
>
</
p
>
<
p
type
="
head
">
<
s
id
="
s.002194
">
<
emph
type
="
italics
"/>
Problema Secundum.
<
emph.end
type
="
italics
"/>
</
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>
</
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<
p
type
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main
">
<
s
id
="
s.002195
">Maior quidem, imò etiam integer circulus, ſed ab oculo in ſummitate
<
lb
/>
montis conſtituto,
<
expan
abbr
="
Soleq́
">Soleque</
expan
>
; iam multum eleuato videri poteſt, vt in
<
lb
/>
hac ſecunda figura cernitur, vbi euecto Sole ad locum E, ſupra horizontem
<
lb
/>
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figure
id
="
id.009.01.128.1.jpg
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place
="
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xlink:href
="
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number
="
66
"/>
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lb
/>
A B, poterit oculus in vertice montis C, poſitus Iridem F G H I, comple
<
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tam videre, quia infra lineam E C D, in qua exiſtunt Sol, oculus, & Iridis
<
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centrum, nihil eſt ad partes D, vbi nubes irrorat, quod Iridis apparitioni
<
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ſit impedimento.</
s
>
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</
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