Biancani, Giuseppe, Aristotelis loca mathematica, 1615

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157[Figure 57]
ſemper ſemicirculo, minus autem,
cum in meridie fuerit aſtrum) quod
ſupra monui, iterum moneo, re­
tinendam
vocem reflexionis, quam­
uis
in antiqua tranſlatione lega­
tur refractio, eſt enim apud om­
nes in confeſſo Iridem fieri per
reflexionem.
Eſt igitur in ſupe­
riori figura, quam textui, vt par
erat reſtitui, horizon G K O. cuius centrum K. in quo eſt viſus noſter, ſitque;
hemiſphærium noſtrum in arcu G A M O, repræſentatum, ſitque; nubes rori­
da, in qua Iris appareat, vbi M, quod punctum M, nubem referens, in figu­
ra ponitur in hemiſphærij ambitu, quod cœlum repræſentat, cum tamen
nubes
parum à terra ſubuehatur; id enim ad demonſtrationem ferè perinde
eſt.
in oriente G, ſit aſtrum. ſi ergò lineæ viſuales à K, ad M, nubem tenden­
tes reflectantur ſuper maiorem angulum M K G, ad G, erit reflexarum vna
veluti M G.
Porro omnes lineæ viſuales, quæ ad nubem M, incidunt, neceſ­
ſariò, vt probabo, cadent in ambitum circularem.
debemus enim innume­
ras
lineas imaginari à K, in coni figuram excidentes, cuius vertex ſit in K,
& axis G K O, quas omnes repræſentat vna K M, meliusque; repræſentabit, fi
cogitemus axem G K O, circa polos G, O, manentes circumuolui, ſecumque;
lineam K M, circumducere.
in hac etiam giratione linea K M, tranſibit per
omnes illas lineas, quas imaginabamur; deſcribetque; conum, quem illæ con­
formare debebant.
In prædicta autem axis volutatione, extremum M, li­
neæ K M, neceſſariò deſcribit circulum, qui eſt circulus Iridis, & eſt baſis
memorati coni.
264
58[Figure 58]

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