Biancani, Giuseppe, Aristotelis loca mathematica, 1615

Table of figures

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              <s id="s.004040">
                <pb pagenum="237" xlink:href="009/01/237.jpg"/>
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              Solis diſceſſum peripheria eius aſpici poteſt, ita vt recta appareat. </s>
              <s id="s.004041">altera verò pars
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              circularis, quoniam ex aduersò noſtri aſpectus hemiſphærium eſt; talis verò appa­
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              ret ſemicirculus. </s>
              <s id="s.004042">ſemper enim Luna aſpectui nostro oppoſita eſt, ſed quando Sol in­
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              cubuerit, non videtur, & repletur post diem octauum ſecundum dimidium; quo­
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              niam paulatim Sol euadens, orbem nobis facit inclinatiorem; ita verò circulus ad
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              oculum noſtrum diſpoſitus, ſimilis videtur ſectioni conicæ. </s>
              <s id="s.004043">lunaris verò apparet
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              iam Sole amoto; cùm enim ad extrema puncta peruenerit, iuxta quæ dimidiata
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              apparet, circulus fit Solis, & Solis circunferentia videtur; non enim amplius in
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              directum viſui iacet, ſed præterit. </s>
              <s id="s.004044">quo facto, & per eadem puncta ducto circulo, ne­
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              ceſſe eſt lunularem apparere: pars enim aliqua circuli ſtatim aſpectui patet, priori è
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              contra exiſtente, ita vt de ſplendido reſecetur. </s>
              <s id="s.004045">tum etiam extrema
                <expan abbr="manẽt">manent</expan>
              in eodem,
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              vt oporteat lunularem apparere magis, & minus, ſecundum Solis motum. </s>
              <s id="s.004046">per­
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              moto enim Sole, & circulus, ſecundum quem conſpicitur, reuertitur ad eadem
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              puncta. </s>
              <s id="s.004047">ſecundum enim infinitas inclinationes accidit inclinari: ſi quidem maxi­
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              mi circuli per eadem puncta duci poſſunt infiniti)
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              Vt rectè textum hunc intel­
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              ligas, lege prius, quæ de Lunæ illuminatione lib. 1. Poſt. tex. 30. dicta ſunt.
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              <s id="s.004048">& ante omnia experire in pila aliqua lumini lucernæ, aut candelæ obiecta,
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              & circumlata, omnes illius ſpheræ illuminationes, vt ibi docui. </s>
              <s id="s.004049">videbis enim
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              qua ratione linea illa, quæ confinium eſt partis illuminatæ, & partis obſcu­
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              ræ, aliquando videatur lunularis, aliquando oualis, aliquando recta linea,
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              quorum rationem Ariſt. in præſenti problemate inquirit. </s>
              <s id="s.004050">lege præterea, ſi
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              plenam huius rei cognitionem deſideras, propoſit. </s>
              <s id="s.004051">74. 75. 76. 77. libri 4.
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              Vitellionis, vbi hæc omnia exactè, & non leui brachio, vt hic fit ab Ariſtot.
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              demonſtrantur. </s>
              <s id="s.004052">Interim tamen huius loci explicationem hanc accipe. </s>
              <s id="s.004053">Cur
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              cùm Luna ſemiplena eſt, linea illa, quæ terminus eſt partis illuminatæ, &
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              partis obſcuræ,
                <expan abbr="quæq́">quæque</expan>
              ; Lunam bifariam diuidit, videtur linea recta, cùm ta­
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              men non ſit; cùm enim fit in globoſa ſuperficie Lunæ, neceſſariò circularis
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                <figure id="id.009.01.237.1.jpg" place="text" xlink:href="009/01/237/1.jpg" number="146"/>
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              eſt? </s>
              <s id="s.004054">vt autem rem hanc melius intelli­
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              gamus, præſens figura illuminationis
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              Lunæ inſpicienda eſt: vbi oculus noſter
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              eſt in centro mundi A; vnde varias Lu­
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              næ illuminationes aſpicit: è quibus
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              octo tantum, in figura ſunt depictæ: in
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              quibus videre eſt Lunæ ſemper dimi­
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              dium illud, ſiue hemiſphærium, quod
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              Solem aſpicit, eſſe illuminatum, cuius
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              terminus, ſiue baſis eſt linea K L,
                <expan abbr="eſtq́">eſtque</expan>
              ;
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              confinium illuſtratæ partis, & opacæ.
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              </s>
              <s id="s.004055">quæ linea ſemper in Luna eſt circula­
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              ris, cum ſit in ſphęrico corpore: quan­
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              do tamen Luna videtur ſemiplena, vt
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                <expan abbr="quãdo">quando</expan>
              eſt in D, vel in K. hæc linea K L,
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              videtur recta. </s>
              <s id="s.004056">ratio huius eſt, quia exi­
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              ſtente Luna ſemiplena, circulus K D L,
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              qui eſt baſis illuminationis ſolaris, eſt in eodem plano cum oculo A, ſiue in
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              eadem rectitudine, vt apparet in figura, vbi, fi linea K D L, ſumatur loco </s>
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