Galilei, Galileo, The systems of the world, 1661

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="065/01/086.jpg" pagenum="80"/>
              darkneſſe; for that that matter which admits the paſſage of the
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              Suns rayes thorow a ſpace of two thouſand miles, muſt needs be
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              ſo tranſparent, that it would very weakly reſiſt them in a
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              dredth, or leſſer part of that thickneſſe; nevertheleſſe, the term
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              which ſeparateth the part illuminated from the obſcure, is
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              dent, and as diſtinct, as white is diſtinct from black; and
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              ſpecially where the Section paſſeth through the part of the Moon,
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              that is naturally more clear and montanous; but where the old
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              ſpots do part, which are certain plains, that by means of their
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              ſpherical inclination, receive the rayes of the Sun obliquely,
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              there the term is not ſo diſtinct, by reaſon of the more dimme
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              lumination. </s>
              <s>That, laſtly, which he ſaith, how that the ſecondary
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              light doth not diminiſh and languiſh, according as the Moon
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              creaſeth, but conſerveth it ſelf continually in the ſame efficacy;
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              is moſt falſe; nay it is hardly ſeen in the quadrature, when, on
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              the contrary, it ſhould appear more ſplendid, and be viſible after
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              the
                <emph type="italics"/>
              crepuſculum
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              in the dark of night. </s>
              <s>Let us conclude therefore,
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              that the Earths reflection is very ſtrong upon the Moon; and that,
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              which you ought more to eſteem, we may deduce from thence
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              other admirable congruity between the Moon and Earth;
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                <arrow.to.target n="marg204"/>
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              ly, that if it be true, the Planets operate upon the Earth by their
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              motion and light, the Earth may probably be no leſſe potent in
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              operating reciprocally upon them with the ſame light, and
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              venture, motion alſo. </s>
              <s>And though it ſhould not move, yet may
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              it retain the ſame operation; becauſe, as it hath been proved
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              ready, the action of the light is the ſelf ſame, I mean of the light
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              of the Sun reflected; and motion doth nothing, ſave only vary
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              the aſpects, which fall out in the ſame manner, whether we make
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              the Earth move, and the Sun ſtand ſtill, or the contrary.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg204"/>
                <emph type="italics"/>
              The Earth may
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              ciprocally operate
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              upon Cœleſtial
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              dies, with its light.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>None of the Philoſophers are found to have ſaid, that
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              theſe inferiour bodies operate on the Cœleſtial, nay,
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              Ariſtotle
                <emph.end type="italics"/>
                <lb/>
              firmes the direct contrary.</s>
            </p>
            <p type="main">
              <s>SALV.
                <emph type="italics"/>
              Aristotle
                <emph.end type="italics"/>
              and the reſt, who knew not that the Earth and
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              Moon mutually illuminated each other, are to be excuſed; but
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              they would juſtly deſerve our cenſure, if whileſt they deſire that
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              we ſhould grant and believe with them, that the Moon operateth
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              upon the Earth with light, they ſhould deny to us, who have
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              taught them that the Earth illuminates the Moon, the operation
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              the Earth hath on the Moon.</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>In ſhort, I find in my ſelf a great unwillingneſſe to
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              admit this commerce, which you would perſwade me to be
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              twixt the Earth and Moon, placing it, as we ſay, amongſt the
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              number of the Stars; for if there were nothing elſe, the great
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              ſeparation and diſtance between it and the Cœleſtial bodies, doth
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              in my opinion neceſſarily conclude a vaſt diſparity between them.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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