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

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="040/01/335.jpg" pagenum="315"/>
              proach towards the
                <emph type="italics"/>
              Æquilibrium,
                <emph.end type="italics"/>
              the incurvation of the arches
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              of the courſes on the contrary ſhall, by degrees, increaſe.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg582"/>
                <emph type="italics"/>
              A concipt that
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              came ſuddenly
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              to the minde of
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              the Academian
                <emph.end type="italics"/>
                <lb/>
              Lyncæus
                <emph type="italics"/>
                <lb/>
              ing the great
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              ſequence that
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              lowed upon the
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              tion of the Solar
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              ſpots.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg583"/>
                <emph type="italics"/>
              Extravagant
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              tations to be
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              ved in the motions
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              of the ſpots,
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              ſeen by the
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              demick, in caſe
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              the Earth had the
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              annual motion.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>I confeſſe,
                <emph type="italics"/>
              Salviatus,
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              that to interrupt you in your
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              Diſcourſe is ill manners, but I eſteem it no leſſe rudeneſs to
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              mit you to run on any farther in words, whilſt they are, as the
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              ſaying is, caſt into the air: for, to ſpeak freely, I know not how
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              to form any diſtinct conceit of ſo much as one of theſe
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              ons, that you have pronounced; but becauſe, as I thus
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              ly and confuſedly apprehend them, they hold forth things of
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              mirable conſequence, I would gladly, ſome way or other, be
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              made to underſtand the ſame.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>The ſame that befalls you, befell me alſo, whilſt my
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              Gueſt tranſported me with bare words; who afterwards aſſiſted
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              my capacity, by deſcribing the buſineſſe upon a material
                <lb/>
                <arrow.to.target n="marg584"/>
                <lb/>
              ment, which was no other than a ſimple Sphere, making uſe of
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              ſome of its circles, but to a different purpoſe from that, to which
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              they are commonly applied. </s>
              <s>Now I will ſupply the defect of
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              the Sphere, by drawing the ſame upon a piece of paper, as need
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              ſhall require. </s>
              <s>And to repreſent the firſt accident by me
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              ded, which was, that the courſes or journeys of the ſpots, twice
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              a year, and no more, might be ſeen to be made in right lines, let
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              us ſuppoſe this point O [
                <emph type="italics"/>
              in Fig.
                <emph.end type="italics"/>
              4.] to be the centre of the grand
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              Orb, or, if you will, of the Ecliptick, and likewiſe alſo of the
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              Globe of the Sun it ſelf; of which, by reaſon of the great
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              ſtance that is between it and the Earth, we that live upon the
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              Earth, may ſuppoſe that we ſee the one half: we will therefore
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              deſcribe this circle A B C D about the ſaid centre O, which
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              ſenteth unto us the extream term that divideth and ſeparates the
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              Hemiſphere of the Sun that is apparent to us, from the other that
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              is occult. </s>
              <s>And becauſe that our eye, no leſſe than the centre of
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              the Earth, is underſtood to be in the plane of the Ecliptick, in
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              which is likewiſe the centre of the Sun, therefore, if we ſhould
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              fancy to our ſelves the body of the Sun to be cut thorow by the
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              ſaid plane, the ſection will appear to our eye a right line, which
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              let be B O D, and upon that a perpendicular being let fall AOC,
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              it ſhall be the Axis of the ſaid Ecliptick, and of the annual
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              tion of the Terreſtrial Globe. </s>
              <s>Let us next ſuppoſe the Solar body
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              (without changing centre) to revolve in it ſelf, not about the
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              Axis A O C (which is the erect Axis upon the plane of the
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              cliptick) but about one ſomewhat inclined, which let be this
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              E O I, the which fixed and unchangeable Axis maintaineth it ſelf
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              perpetually in the ſame inclination and direction towards the
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              ſame points of the Firmament, and of the Univerſe. </s>
              <s>And
                <lb/>
              cauſe, in the revolutions of the Solar Globe, each point of its
                <lb/>
              perficies (the Poles excepted) deſcribeth the circumference of a </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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