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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That the Earth may be a Planet.
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              <pb o="104" file="0284" n="284" rhead="That the Earth may be a Planet."/>
            anſwerable to the ſeveral diſtances of the
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            Planets from one another.</s>
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            <note symbol="*" position="right" xlink:label="note-0283-04" xlink:href="note-0283-04a" xml:space="preserve">Lib. 13.
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            prop. 14,
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            15, &c.</note>
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          <p>
            <s xml:space="preserve">Thus a Cube will meaſure the diſtance be-
              <lb/>
            twixt Saturn and Jupiter; </s>
            <s xml:space="preserve">a Pyramis or Te-
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            traëdron, the diſtance betwixt Jupiter and
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            Mars ; </s>
            <s xml:space="preserve">a Dodecaëdron, the diſtance betwixt
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            Mars and the Earth; </s>
            <s xml:space="preserve">an Icoſaëdron, the diſtance
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            betwixt the Earth & </s>
            <s xml:space="preserve">Venus; </s>
            <s xml:space="preserve">and an Octoëdron,
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            the diſtance betwixt Venus & </s>
            <s xml:space="preserve">Mercury: </s>
            <s xml:space="preserve">that
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            is, if we conceive a Circumference deſcri-
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            bed immediately without the Cube, and a-
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            nother within it, the diſtance between theſe
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            two, will ſhew what proportional diſtance
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            there is betwixt the Orb of Saturn, and
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            that of Jupiter. </s>
            <s xml:space="preserve">Thus alſo, if you con-
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            ceive a Circumference deſcribed on the out-
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            ſide of a Pyramis, or Tetraëdron, and ano-
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            ther within it, this will ſhew ſuch a propor-
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            tional diſtance, as there is betwixt the Orb
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            of Mars, from that of Jupiter. </s>
            <s xml:space="preserve">And ſo of
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            the reſt.</s>
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          <p>
            <s xml:space="preserve">Now if any ask why there are but ſix
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            Planetary Orbs? </s>
            <s xml:space="preserve">Keplar anſwers, Zuia non
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            oportet plures quàm quinque proportiones eſſe,
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            totidem nempè quot regularia ſunt in Matheſi
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            corpora. </s>
            <s xml:space="preserve">Sex autem termini conſummant hunc
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            proportionum numerum: </s>
            <s xml:space="preserve">Becauſe there are
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            but five proportions, ſo many as there are
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            regular Bodies in Mathematicks, each of
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            whoſe Sides and Angles are equal one to
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            another. </s>
            <s xml:space="preserve">But now there are ſix terms re-
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            quired to conſummate this number of pro-
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            portions; </s>
            <s xml:space="preserve">and ſo conſequently, there can
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            be but ſix primary Planets.</s>
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