Galilei, Galileo, The systems of the world, 1661

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    <archimedes>
      <text>
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          <chap>
            <p type="main">
              <s>
                <pb xlink:href="065/01/026.jpg" pagenum="20"/>
              uſe, in the ordinate parts of the World; and we did proceed to
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              ſay, that it was not ſo in circular motions, of which that which is
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              made by the moveable in it ſelf, ſtill retains it in the ſame place,
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                <arrow.to.target n="marg50"/>
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              and that which carrieth the moveable by the circumference of a
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              circle about its fixed centre, neither puts it ſelf, nor thoſe about it
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              in diſorder; for that ſuch a motion primarily is finite and terminate
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              (though not yet finiſhed and determined) but there is no point
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                <arrow.to.target n="marg51"/>
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              in the circumference, that is not the firſt and laſt term in the
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              culation; and continuing it in the circumference aſſigned it, it
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              leaveth all the reſt, within and without that, free for the uſe of
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              others, without ever impeding or diſordering them. </s>
              <s>This being
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              a motion that makes the moveable continually leave, and
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                <arrow.to.target n="marg52"/>
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              tinually arrive at the end; it alone therefore can primarily be
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              niform; for that acceleration of motion is made in the moveable,
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              when it goeth towards the term, to which it hath inclination;
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              and the retardation happens by the repugnance that it hath to
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              leave and part from the ſame term; and becauſe in circular
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              tion, the moveable continually leaves the natural term, and
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              tinually moveth towards the ſame, therefore, in it, the
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              nance and inclination are always of equal force: from which
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              quality reſults a velocity, neither retarded nor accelerated,
                <emph type="italics"/>
              i. </s>
              <s>e.
                <emph.end type="italics"/>
              an
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              uniformity in motion. </s>
              <s>From this conformity, and from the being
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                <arrow.to.target n="marg53"/>
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              terminate, may follow the perpetual continuation by ſucceſſively
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              reiterating the circulations; which in an undeterminated line,
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              and in a motion continually retarded or accelerated, cannot
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              turally be. </s>
              <s>I ſay, naturally; becauſe the right motion which is
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              retarded, is the violent, which cannot be perpetual; and the
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              celerate arriveth neceſſarily at the term, if one there be; and if
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              there be none, it cannot be moved to it, becauſe nature moves
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              not whether it is impoſſible to attain. </s>
              <s>I conclude therefore, that
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              the circular motion can onely naturally conſiſt with natural
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              dies, parts of the univerſe, and conſtituted in an excellent
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              ſure; and that the right, at the moſt that can be ſaid for it, is
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                <arrow.to.target n="marg55"/>
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              aſſigned by nature to its bodies, and their parts, at ſuch time as
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              they ſhall be out of their proper places, conſtituted in a depraved
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              diſpoſition, and for that cauſe needing to be redured by the
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              eſt way to their natural ſtate. </s>
              <s>Hence, me thinks, it may
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              nally be concluded, that for maintenance of perfect order among ſt
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              the parts of the World, it is neceſſary to ſay, that moveables are
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              moveable onely circularly; and if there be any that move not
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                <arrow.to.target n="marg56"/>
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              circularly, theſe of neceſſity are immoveable: there being
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              thing but reſt and circular motion apt to the conſervation of
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              der. </s>
              <s>And I do not a little wonder with my ſelf, that
                <emph type="italics"/>
              Ariſtotle,
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              who held that the Terreſtrial globe was placed in the centre of
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              the World, and there remained immoveable, ſhould not ſay, that </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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