Wilkins, John, A discovery of a new world : or a discourse tending to prove, that 'tis probable there may be another Habitable World in the Moon ; with a discourse concerning the Probability of a Passage thither; unto which is added, a discourse concerning a New Planet, tending to prove, that 'tis probable our earth is one of the Planets

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        <div xml:id="echoid-div274" type="section" level="1" n="60">
          <pb o="92" file="0272" n="272" rhead="That the Earth may be a Planet."/>
          <p>
            <s xml:id="echoid-s4064" xml:space="preserve">3. </s>
            <s xml:id="echoid-s4065" xml:space="preserve">’Tis conſiderable, That the Spheres of
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            Saturn, Jupiter, Mars, are, according to the
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            general opinion, of very great extenſion ;
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            </s>
            <s xml:id="echoid-s4066" xml:space="preserve">and yet each of them is appointed only to
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            carry about its particular Planet, which are
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            but very little in compariſon of the fixed
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            Stars. </s>
            <s xml:id="echoid-s4067" xml:space="preserve">Now if for the ſcituation of theſe
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            fixed Stars, there ſhould be allotted a pro-
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            portionable part of the World, ’tis certain,
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            that their Orb muſt be far bigger than it is
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            commonly ſuppoſed, and very near to this
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            Opinion of Copernicus.</s>
            <s xml:id="echoid-s4068" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4069" xml:space="preserve">4. </s>
            <s xml:id="echoid-s4070" xml:space="preserve">We uſually judg the bigneſs of the
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            higher Orbs, by their different motions. </s>
            <s xml:id="echoid-s4071" xml:space="preserve">As
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            becauſe Saturn finiſhes his courſe in thirty
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            Years, and Jupiter in twelve, therefore we
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            attribute unto thoſe Orbs, ſuch a different
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            proportion in their bigneſs. </s>
            <s xml:id="echoid-s4072" xml:space="preserve">Now if by this
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            Rule we ſhould find out the quantity of the
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            eighth Sphere, we ſhall diſcern it to be far
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            nearer unto that bigneſs, which Copernicus
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            ſuppoſeth it to have, than that which Pto-
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            lomy, Tycho, and others, ordinarily aſcribe
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            unto it. </s>
            <s xml:id="echoid-s4073" xml:space="preserve">For the ſtarry Heaven (ſay they)
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            does not finiſh his courſe under 26000 Years;
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            </s>
            <s xml:id="echoid-s4074" xml:space="preserve">whereas Saturn, which is next unto it, does
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            compaſs his Orb in thirty Years. </s>
            <s xml:id="echoid-s4075" xml:space="preserve">From
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            whence it will probably follow, that there is
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            a very great diſtance betwixt theſe in place,
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            becauſe they have ſuch different terms of
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            their Revolutions.</s>
            <s xml:id="echoid-s4076" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4077" xml:space="preserve">But againſt this Anſwer: </s>
            <s xml:id="echoid-s4078" xml:space="preserve">Unto the laſt
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            Argument, our Adverſaries thus reply:</s>
            <s xml:id="echoid-s4079" xml:space="preserve"/>
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