Biancani, Giuseppe
,
Aristotelis loca mathematica
,
1615
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Additio de Iride.
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<
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id
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s.002155
">Cvm ſuperior Ariſtot. de Iride tractatio obſcura, ac tricis pluribus
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lb
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impedita euaſerit,
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abbr
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cumq́
">cumque</
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; aliorum etiam demonſtrationes aliqua
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ex parte vacillent, viſum eſt breuiter expeditam,
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expan
abbr
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atq;
">atque</
expan
>
abſolutam
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ipſius apponere demonſtrationem. </
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<
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id
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s.002156
">Cum igitur in cœleſti arcu
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duo potiſſimum ſint, quæ ſui admiratione
<
expan
abbr
="
Philoſophorũ
">Philoſophorum</
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>
animos in ſui con
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lb
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templationem alliciant, colores, ſcilicet, & figura: nos mirabilem illam co
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lorum triadem, tanquam alienam, phyſicis relinquentes, de figura ipſius iu
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re mathematico diſſeremus: rotunditatis ſcilicet Iridis cauſam opticis ra
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tionibus venabimur, cur aliquando ſemicirculus, aliquando ſemicirculo mi
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nor appareat. </
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<
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">vt igitur ordine procedamus.</
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<
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id
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s.002158
">Primo loco aduertendum eſt tria ad Iridis viſionem eſſe neceſſaria, So
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lem, oculum, & nubem tenuem, ac roſcidam, quæ ſcilicet minutis guttulis
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iam ſcateat; hac enim ratione guttulæ illæ innumera erunt veluti parua
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ſpecula, quæ lumen Solis ob paruitatem imperfecto quodam modo repre
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ſentare poſſint, ex tali enim repreſentatione Iris apparet. </
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<
s
id
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">quæ tria debent
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eſſe ita diſpoſita, vt Sol, oculus, & centrum Iridis ſint in eadem recta linea
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conſtituta,
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expan
abbr
="
oculusq́
">oculusque</
expan
>
; medium locum, inter Solem, & Iridis
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expan
abbr
="
cẽtrum
">centrum</
expan
>
obtineat,
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lb
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vt in prima figura videre eſt, in qua Sol vbi A, oculus in C. nubes verò
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G H L E, in qua apparet Iris in arcu E B F, quem debemus concipere eſſe
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in receſſu, vt pictores aiunt, depictum. </
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<
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">i. </
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<
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id
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">non in hoc ſitu, & ouali figura, ſed
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eſſe perfectè ſemicircularem,
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abbr
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habereq́
">habereque</
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>
; talem poſitionem, vt pars ipſius B F,
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lb
/>
ſit citra chartam eleuata,
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abbr
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ipſiq́
">ipſique</
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>
; perpendicularis, pars verò E B, vltra </
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