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

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      <text>
        <body>
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            <p type="main">
              <s>
                <pb xlink:href="040/01/351.jpg" pagenum="331"/>
              nor a leſſe mutation being diſcerned in the fixed Stars, methinks
                <lb/>
              that by this means the annual motion of the Earth is deſtroyed
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              and overthrown.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>You might very well ſo conclude,
                <emph type="italics"/>
              Simplicius,
                <emph.end type="italics"/>
              if we
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              had nothing elſe to ſay in behalf of
                <emph type="italics"/>
              Copernicus
                <emph.end type="italics"/>
              : but we have
                <lb/>
              many things to alledge that yet have not been mentioned; and
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              as to that your reply, nothing hindereth, but that we may
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              poſe the diſtance of the fixed Stars to be yet much greater than
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              that which hath been allowed them, and you your ſelf, and
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              ever elſe will not derogate from the propoſitions admitted by
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                <emph type="italics"/>
              Piolomy
                <emph.end type="italics"/>
              's ſectators, muſt needs grant it as a thing moſt requiſite
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              to ſuppoſe the Starry Sphere to be very much bigger yet than
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              that which even now we ſaid that it ought to be eſteemed. </s>
              <s>For
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                <arrow.to.target n="marg615"/>
                <lb/>
              all Aſtronomers agreeing in this, that the cauſe of the greater
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              tardity of the Revolutions of the Planets is, the majority of
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              their Spheres, and that therefore
                <emph type="italics"/>
              Saturn
                <emph.end type="italics"/>
              is more flow than
                <emph type="italics"/>
                <lb/>
              piter,
                <emph.end type="italics"/>
              and
                <emph type="italics"/>
              Jupiter
                <emph.end type="italics"/>
              than the Sun, for that the firſt is to deſcribe a
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              greater circle than the ſecond, and that than this later, &c. </s>
              <s>
                <lb/>
              ſidering that
                <emph type="italics"/>
              Saturn v.g.
                <emph.end type="italics"/>
              the altitude of whoſe Orb is nine times
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              higher than that of the Sun, and that for that cauſe the time of
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              one Revolution of
                <emph type="italics"/>
              Saturn,
                <emph.end type="italics"/>
              is thirty times longer than that of a
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              converſion of the Sun, in regard that according to the Doctrine
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              of
                <emph type="italics"/>
              Ptolomy,
                <emph.end type="italics"/>
              one converſion of the ſtarry Sphere is finiſhed in
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              36000. years, whereas that of
                <emph type="italics"/>
              Saturn
                <emph.end type="italics"/>
              is conſummate in thirty,
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              and that of the Sun in one, arguing with a like proportion, and
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                <arrow.to.target n="marg616"/>
                <lb/>
              ſaying, if the Orb of
                <emph type="italics"/>
              Saturn,
                <emph.end type="italics"/>
              by reaſon it is nine times bigger
                <lb/>
              than that of the Sun, revolves in a time thirty times longer, by
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              converſion, how great ought that Orb to be, which revolves
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              36000. times more ſlowly? </s>
              <s>it ſhall be found that the diſtance of
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              the ſtarry Sphere ought to be 10800 ſemidiameters of the grand
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              Orb, which ſhould be full five times bigger than that, which even
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              now we computed it to be, in caſe that a fixed Star of the ſixth
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              magnitude were equal to the Sun. </s>
              <s>Now ſee how much leſſer yet,
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              upon this account, the variation occaſioned in the ſaid Stars, by
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              the annual motion of the Earth, ought to appear. </s>
              <s>And if at the
                <lb/>
              ſame rate we would argue the diſtance of the ſtarry Sphere from
                <lb/>
                <arrow.to.target n="marg617"/>
                <lb/>
                <emph type="italics"/>
              Jupiter,
                <emph.end type="italics"/>
              and from
                <emph type="italics"/>
              Mars,
                <emph.end type="italics"/>
              that would give it us to be 15000. and
                <lb/>
              this 27000 ſemidiameters of the grand Orb, to wit, the firſt
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              ſeven, and the ſecond twelve times bigger than what the
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              nitude of the fixed Star, ſuppoſed equal to the Sun, did make
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              it.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg615"/>
                <emph type="italics"/>
              All
                <lb/>
              mers agree that
                <lb/>
              the greater
                <lb/>
              tudes of the Orbes
                <lb/>
              is the cauſe of the
                <lb/>
              tardity of the
                <lb/>
              verſions.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg616"/>
                <emph type="italics"/>
              By another
                <lb/>
              poſition taken from
                <lb/>
              Aſtronomers, the
                <lb/>
              diſtance of the
                <lb/>
              ed Stars is
                <lb/>
              lated to be 10800
                <lb/>
              ſemidiameters of
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              the grand Orb.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg617"/>
                <emph type="italics"/>
              By the proportion
                <lb/>
              of
                <emph.end type="italics"/>
              Jupiter
                <emph type="italics"/>
              and of
                <emph.end type="italics"/>
                <lb/>
              Mais,
                <emph type="italics"/>
              the ſtarry
                <lb/>
              Sphere is found to
                <lb/>
              be yet more remote.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>Methinks that to this might be anſwered, that the
                <lb/>
              tion of the ſtarry Sphere hath, ſince
                <emph type="italics"/>
              Ptolomy,
                <emph.end type="italics"/>
              been obſerved not
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              to be ſo ſlow as he accounted it; yea, if I miſtake. </s>
              <s>not, I have
                <lb/>
              heard that
                <emph type="italics"/>
              Copernicus
                <emph.end type="italics"/>
              himſelf made the Obſervation.</s>
            </p>
          </chap>
        </body>
      </text>
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