Galilei, Galileo, The systems of the world, 1661

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="065/01/080.jpg" pagenum="74"/>
              the wall hath it? </s>
              <s>The Sun ſhineth on that wall; from thence it </s>
            </p>
            <p type="main">
              <s>
                <arrow.to.target n="marg191"/>
                <lb/>
              is reverberated upon the wall of the Hall, from thence it's
                <lb/>
              cted upon that chamber, ſo that it falls on it at the third reflection:
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              and I am very certain, that there is in that place more light, than
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              if the Moons light had directly faln upon it.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg191"/>
                <emph type="italics"/>
              The third
                <lb/>
              ction of a Wall
                <lb/>
              minates more than
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              the firſt of the
                <lb/>
              Moon.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>But this I cannot believe; for the illumination of the
                <lb/>
              Moon, eſpecially when it is at the full, is very great.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>It ſeemeth great by reaſon of the circumjacent dark
                <lb/>
                <arrow.to.target n="marg192"/>
                <lb/>
              places; but abſolutely it is not much, and is leſs than that of the
                <lb/>
              twilight half an hour after the Sun is ſet; which is manifeſt,
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              cauſe you ſee not the ſhadows of the bodies illuminated by the
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              Moon till then, to begin to be diſtinguiſhed on the Earth. </s>
              <s>
                <lb/>
              ther, again, that third reflection upon that chamber, illuminates
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              more than the firſt of the Moon, may be known by going thether,
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              and reading a Book, and afterwards ſtanding there in the night
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              by the Moons light, which will ſhew by which of them lights one
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              may read more or leſs plainly, but I believe without further tryal,
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              that one ſhould ſee leſs diſtinctly by this later.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg192"/>
                <emph type="italics"/>
              The light of the
                <lb/>
              Moon weaker than
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              that of the
                <lb/>
              light.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SALV. Now,
                <emph type="italics"/>
              Simplicius,
                <emph.end type="italics"/>
              (if haply you be ſatisfied) you may
                <lb/>
              conceive, as you your ſelf know very well, that the Earth doth
                <lb/>
              ſhine no leſs than the Moon; and the only remembring you of ſome
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              things, which you knew of your ſelf, and learn'd not of me, hath
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              aſſured you thereof: for I taught you not that the Moon ſhews
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              lighter by night than by day, but you underſtood it of your ſelf;
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              as alſo you could tell me that a little Cloud appeareth as lucid as
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              the Moon: you knew alſo, that the illumination of the Earth
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              not be ſeen by night; and in a word, you knew all this, without
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              knowing that you knew it. </s>
              <s>So that you have no reaſon to be
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              pulous of granting, that the dark part of the Earth may illuminate
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              the dark part of the Moon, with no leſs a light than that
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              with the Moon illuminates the obſcurities of the night, yea rather
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              ſo much the greater, inaſmuch as the Earth is forty times bigger
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              than the Moon.</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>I muſt confeſs that I did believe, that that ſecondary
                <lb/>
              light had been the natural light of the Moon.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>And this alſo you know of your ſelf, and perceive not
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              that you know it. </s>
              <s>Tell me, do not you know without teaching,
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              that the Moon ſhews it ſelf more bright by night than by day, in
                <lb/>
                <arrow.to.target n="marg193"/>
                <lb/>
              reſpect of the obſcurity of the ſpace of the ambient? </s>
              <s>and
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              quently, do you not know
                <emph type="italics"/>
              in genere,
                <emph.end type="italics"/>
              that every bright body ſhews
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              the clearer, by how much the ambient is obſcurer?</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg193"/>
                <emph type="italics"/>
              Luminous bodies
                <lb/>
              appear the brighter
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              in an obſcurer
                <emph.end type="italics"/>
                <lb/>
              bient.</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>This I know very well.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>When the Moon is horned, and that ſecondary light
                <lb/>
              ſeemeth to you very bright, is it not ever nigh the Sun, and
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              ſequently, in the light of the
                <emph type="italics"/>
              crepuſculum,
                <emph.end type="italics"/>
              (twilight?)</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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