Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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            <p type="main">
              <s>
                <pb xlink:href="040/01/082.jpg" pagenum="66"/>
              which being of a ſpherical figure, if its ſuperficies were ſmooth, as
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              this paper, the parts of its hemiſphere illuminated by the Sun,
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              which are towards its extremity, would receive much leſs light,
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              than the middle parts; the rays falling upon them moſt obliquely,
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              and upon theſe at right angles; whereupon at the time of full
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              Moon, when we ſee almoſt its whole Hemiſphere illuminated, the
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              parts towards the midſt, would ſhew themſelves to us with more
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              ſplendor, than thoſe others towards the circumference: which is
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              not ſo in effect. </s>
              <s>Now the face of the Moon being repreſented
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              to me full of indifferent high mountains, do not you ſee how their
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              tops and continuate ridges, being elevated above the convexity of
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              the perfect ſpherical ſuperficies, come to be expoſed to the view
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              of the Sun, and accommodated to receive its rays much leſs
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              liquely, and conſequently to appear as luminous as the reſt?</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg177"/>
                <emph type="italics"/>
              The more oblique
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              Rayes illuminate
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              leß, and why.
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              </s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>All this I well perceive: and if there are ſuch
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              tains, its true, the Sun will dart upon them much more directly
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              than it would do upon the inclination of a polite ſuperficies: but
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              it is alſo true, that betwixt thoſe mountains all the valleys would
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              become obſcure, by reaſon of the vaſt ſhadows, which in that
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              time would be caſt from the mountains, whereas the parts towards
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              the middle, though full of valleys and hills, by reaſon they have
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              the Sun elevated, would appear without ſhadow, and therefore
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              more lucid by far than the extreme parts, which are no leſs
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              ſed with ſhadow than light, and yet we can perceive no ſuch
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              rence.</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>I was ruminating upon the like difficulty.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>How much readier is
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              Simplicius
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              to apprehend the
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              jections which favour the opinions of
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              Ariſtotle,
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              than their
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              ons? </s>
              <s>I have a kind of ſuſpition, that he ſtrives alſo ſometimes to
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              diſſemble them; and in the preſent caſe, he being of himſelf able
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              to hit upon the doubt, which yet is very ingenious, I cannot
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              lieve but that he alſo was adviſ'd of the anſwer; wherefore I will
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              attempt to wreſt the ſame (as they ſay) out of his mouth. </s>
              <s>
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              fore tell me,
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              Simplicius,
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              do you think there can be any ſhadow,
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              where the rays of the Sun do ſhine?</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>I believe, nay I am certain that there cannot; for that
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              it being the grand luminary, which with its rays driveth away
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              neſs, it is impoſſible any tenebroſity ſhould remain where it
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              eth; moreover, we have the definition, that
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              Tenebræ ſunt
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              tio luminis.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>Therefore the Sun, beholding the Earth, Moon or
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              ther opacous body, never ſeeth any of its ſhady parts, it not
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              ving any other eyes to ſee with, ſave its rays, the conveyers of
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              light: and conſequently, one ſtanding in the Sun would never
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              ſee any thing of umbrage, foraſmuch as his viſive rays would ever </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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