Biancani, Giuseppe
,
Aristotelis loca mathematica
,
1615
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233
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gulis ob dictam rationem non poteſt, quia radij viſuales, vt dictum eſt, in
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diſcreti ſunt, & confuſi. </
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neq;
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hoc mirum, cùm multa videre nullo pacto poſ
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ſimus, quamuis noſtro attingantur aſpectu, vt ea, quæ ſunt in tenebris, cui
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ſimile accidit, cum quadratum à longè viſum videtur habere plurimos an
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gulos; atq; adeò ad rotunditatem, ſi remoueatur adhuc, accedere, vt etiam
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circulus videatur. </
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<
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id
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">Cùm enim, vt ſupra dixi, aſpectus in turbinis modum
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procedat quoties figura conſpecta vlterius ſepoſita eſt, radij viſuales, qui ad
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angulos tendant, quoniam & imbecilli, & pauci ſunt, ob dictam cauſam rem
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aſſequi nequeunt: qui autem in mediam partem concurrunt, hi perſiſtere
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poſſunt, vtpotè, conferti, & validi: ergò cum figura propè eſt, anguli
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quoq;
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aſpici poſſunt, aucta diſtantia non poſſunt. </
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">hac etiam de cauſa linea circu
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laris valdè diſtans, & in ſitu, quo conuexum ad oculum rectà vergat: & in
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Luna die octauo, quando dimidia eſt linea illa, quæ illuminatam partem à
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non illuminata diuidit, recta videtur, quamuis circularis ſit, eſt enim in
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ſphærico corpore deſignata. </
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<
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id
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">quando enim circunferentia propè eſt, viſus
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diſcernere valet quanto pars altera, parte altera, ſit propior; vnde rotun
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ditas apparet: at cùm procul abeſt rectè ſentire nequit, ſed æqualem par
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tium ſitum cernere ſibi videtur,
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eamq́
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; propterea rectam iudicat. </
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<
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id
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s.003986
">hæc igi
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tur, quæ accidere viſui certum eſt, eadem ſimiliter radijs Solis conuenire
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par eſt credere. </
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<
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id
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">ex quibus iam patere poteſt, cur lumen Solis per quadrila
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teras figuras profluens illuminationem rotundam reddat.</
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De Lucis Figuratione.
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Atq;
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hæc eſt ſolutio admirandi huius effectus ab Ariſt. allata, quæ
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quoniam non paucas habet difficultates, aliam ex Maurolyco de
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ſumptam, quæ ſatis demonſtratiua eſt, afferam.</
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<
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id
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">Primò igitur illud Perſpectiuus principium ſtatuendum eſt, ex
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quolibet corporis lucidi puncto, ad quodlibet medij punctum, lumen rectis
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lineis quoquouerſus emicare, ita vt lumen à quouis puncto lucidi, tanquam
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à centro
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circumquaq;
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effuſum in modum ſphæræ diffundatur.</
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<
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">Secundò, quò magis duorum vicinorum circulorum peripheriæ augen
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tur, eò magis ad vnius circuli ſimilitudinem accedere; vt in hac figura cer
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nere licet, vbi ſunt primò duo parui
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circuli circa centra A, & B, deſcripti,
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quorum circunferentiæ creſcant
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vſq;
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ad circunferentias C D, & E F, quo in
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cremento poſito, ſtatim vel ad ſenſum
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manifeſtum eſt, has duas maiores pe
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ripherias, magis referre vnius circuli
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ſimilitudinem, quàm referant duo pa
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rui circelli. </
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<
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id
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">quod ſi eſſent tres circelli,
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qui augerentur, magis adhuc vnicum
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circulum imitarentur;
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; deinceps,
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quò plures eò perfectius: & quò magis </
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