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

Page concordance

< >
Scan Original
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
< >
page |< < of 701 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="040/01/066.jpg" pagenum="50"/>
              illuminated parts of the Terreſtrial ſuperficies appear beheld from
                <lb/>
              the Moon, depends not on this alone, but on the divers aſpects
                <lb/>
              which the Moon is ſtill changing with the Sun; ſo that, if for
                <lb/>
              ſtance, the Moon punctually followed the motion of the Sun, and
                <lb/>
              ſtood, for example, always in a direct line between it and the
                <lb/>
              Earth, in that aſpect which we call Conjunction, it looking always
                <lb/>
              to the ſame Hemiſphere of the Earth which the Sun looks unto,
                <lb/>
              ſhe would behold the ſame all light: as on the contrary, if it ſhould
                <lb/>
              always ſtay in Oppoſition to the Sun, it would never behold the
                <lb/>
              Earth, of which the dark part would be continually turn'd towards
                <lb/>
              the Moon, and therefore inviſible. </s>
              <s>But when the Moon is in
                <lb/>
              Quadrature of the Sun, that half of the Terreſtrial Hemiſphere
                <lb/>
              poſed to the ſight of the Moon which is towards the Sun, is
                <lb/>
              nous; and the other towards the contrary is obſcure: and
                <lb/>
              fore the illuminated part of the Earth would repreſent it ſelf to the
                <lb/>
              Moon in a ſemi-circular figure.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>I clearly perceive all this, and underſtand very well,
                <lb/>
              that the Moon departing from its Oppoſition to the Sun, where it
                <lb/>
              ſaw no part of the illumination of the Terreſtrial ſuperficies, and
                <lb/>
              approaching day by day nearer the Sun, ſhe begins by little and
                <lb/>
              little to diſcover ſome part of the face of the illuminated Earth;
                <lb/>
              and that which appeareth of it ſhall reſemble a thin ſickle, in regard
                <lb/>
              the figure of the Earth is round: and the Moon thus acquiring by
                <lb/>
              its motion day by day greater proximity to the Sun, ſucceſſively
                <lb/>
              diſcovers more and more of the Terreſtrial Hemiſphere enlightned,
                <lb/>
              ſo that at the Quadrature there is juſt half of it viſible, inſomuch
                <lb/>
              that we may ſee the other part of her: continuing next to proceed
                <lb/>
              towards the Conjunction, it ſucceſſively diſcovers more and more
                <lb/>
              of its ſurface to be illuminated, and in fine, at the time of
                <lb/>
              ction ſeeth the whole Hemiſphere enlightned. </s>
              <s>And in ſhort, I
                <lb/>
              very well conceive, that what befalls the Inhabitants of the Earth,
                <lb/>
              in beholding the changes of the Moon, would happen to him that
                <lb/>
              from the Moon ſhould obſerve the Earth; but in a contrary order,
                <lb/>
              namely, that when the Moon is to us at her full, and in Oppoſition
                <lb/>
              to the Sun, then the Earth would be in Conjunction with the Sun,
                <lb/>
              and wholly obſcure and inviſible; on the contrary, that poſition
                <lb/>
              which is to us a Conjunction of the Moon with the Sun, and for
                <lb/>
              that cauſe a
                <emph type="italics"/>
              M
                <emph.end type="italics"/>
              oon ſilent and unſeen, would be there an Oppoſition
                <lb/>
              of the Earth to the Sun, and, to ſo ſpeak,
                <emph type="italics"/>
              Full Earth,
                <emph.end type="italics"/>
              to wit, all
                <lb/>
              enlightned. </s>
              <s>And laſtly, look what part of the Lunar ſurface
                <lb/>
              pears to us from time to time illuminated, ſo much of the Earth
                <lb/>
              in the ſame time ſhall you behold from the Moon to be obſcured:
                <lb/>
              and look how much of the Moon is to us deprived of light, ſo much
                <lb/>
              of the Earth is to the Moon illuminated. </s>
              <s>In one thing yet theſe
                <lb/>
              mutual operations in my judgment ſeem to differ, and it is, that it </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum