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-div289" type="section" level="1" n="61">
            <s xml:id="echoid-s4234" xml:space="preserve">
              <pb o="104" file="0284" n="284" rhead="That the Earth may be a Planet."/>
            anſwerable to the ſeveral diſtances of the
            Planets from one another.</s>
            <s xml:id="echoid-s4235" xml:space="preserve"/>
            <s xml:id="echoid-s4236" xml:space="preserve">Thus a Cube will meaſure the diſtance be-
            twixt Saturn and Jupiter; </s>
            <s xml:id="echoid-s4237" xml:space="preserve">a Pyramis or Te-
            traëdron, the diſtance betwixt Jupiter and
            Mars ; </s>
            <s xml:id="echoid-s4238" xml:space="preserve">a Dodecaëdron, the diſtance betwixt
            Mars and the Earth; </s>
            <s xml:id="echoid-s4239" xml:space="preserve">an Icoſaëdron, the diſtance
            betwixt the Earth & </s>
            <s xml:id="echoid-s4240" xml:space="preserve">Venus; </s>
            <s xml:id="echoid-s4241" xml:space="preserve">and an Octoëdron,
            the diſtance betwixt Venus & </s>
            <s xml:id="echoid-s4242" xml:space="preserve">Mercury: </s>
            <s xml:id="echoid-s4243" xml:space="preserve">that
            is, if we conceive a Circumference deſcri-
            bed immediately without the Cube, and a-
            nother within it, the diſtance between theſe
            two, will ſhew what proportional diſtance
            there is betwixt the Orb of Saturn, and
            that of Jupiter. </s>
            <s xml:id="echoid-s4244" xml:space="preserve">Thus alſo, if you con-
            ceive a Circumference deſcribed on the out-
            ſide of a Pyramis, or Tetraëdron, and ano-
            ther within it, this will ſhew ſuch a propor-
            tional diſtance, as there is betwixt the Orb
            of Mars, from that of Jupiter. </s>
            <s xml:id="echoid-s4245" xml:space="preserve">And ſo of
            the reſt.</s>
            <s xml:id="echoid-s4246" xml:space="preserve"/>
            <s xml:id="echoid-s4247" xml:space="preserve">Now if any ask why there are but ſix
            Planetary Orbs? </s>
            <s xml:id="echoid-s4248" xml:space="preserve">Keplar anſwers, Zuia non
            oportet plures quàm quinque proportiones eſſe,
            totidem nempè quot regularia ſunt in Matheſi
            corpora. </s>
            <s xml:id="echoid-s4249" xml:space="preserve">Sex autem termini conſummant hunc
            proportionum numerum: </s>
            <s xml:id="echoid-s4250" xml:space="preserve">Becauſe there are
            but five proportions, ſo many as there are
            regular Bodies in Mathematicks, each of
            whoſe Sides and Angles are equal one to
            another. </s>
            <s xml:id="echoid-s4251" xml:space="preserve">But now there are ſix terms re-
            quired to conſummate this number of pro-
            portions; </s>
            <s xml:id="echoid-s4252" xml:space="preserve">and ſo conſequently, there can
            be but ſix primary Planets.</s>
            <s xml:id="echoid-s4253" xml:space="preserve"/>