Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

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          <pb o="565" file="0297" n="312" rhead="SYSTEMA SATURNIUM."/>
          <p>
            <s xml:id="echoid-s6270" xml:space="preserve">Figura porro brachiorum, dum hæc circa motum eorum
              <lb/>
            mente agitabam, ejuſmodi apparebat, qualis in ſuperioribus
              <lb/>
            obſervationibus anni 1655 expreſſa eſt. </s>
            <s xml:id="echoid-s6271" xml:space="preserve">Nempe medium
              <lb/>
            Saturni corpus omnino rotundum erat, brachia vero utrin-
              <lb/>
            que ſecundum eandem rectam lineam protendebantur, velut
              <lb/>
            ſi axe quodam medius planeta trajiceretur, quanquam tubo
              <lb/>
            illo 12 pedum quo tunc utebar, utraque verſus extremas
              <lb/>
              <note position="right" xlink:label="note-0297-01" xlink:href="note-0297-01a" xml:space="preserve">TAB. XLVII.
                <lb/>
              fig. 6.</note>
            cuſpides paulo craſſiora clarioraque videbantur, quam ubi
              <lb/>
            mediæ ſphæræ cohærebant, ut indicat figura. </s>
            <s xml:id="echoid-s6272" xml:space="preserve">Quum ita-
              <lb/>
            que quotidie eandem hanc ſpeciem præ ſe ferret, intel-
              <lb/>
            lexi id alia ratione fieri non poſſe, ſiquidem tam brevis
              <lb/>
            eſſet Saturni eorumque quæ illi cohærent circuitus, niſi ut
              <lb/>
            globus Saturni à corpore alio æqualiter undique cinctus po-
              <lb/>
              <note position="right" xlink:label="note-0297-02" xlink:href="note-0297-02a" xml:space="preserve">Annulo sæ@
                <lb/>
              turnum ci@-
                <lb/>
              gi.</note>
            neretur, atque ita annulus quidam medium eum ambiret.
              <lb/>
            </s>
            <s xml:id="echoid-s6273" xml:space="preserve">Hinc enim, quacunque celeritate circumvolveretur, ean-
              <lb/>
            dem ſemper faciem nobis oblatum iri, ſi nimirum axis ad i-
              <lb/>
            ſtius annuli planum erectus eſſet.</s>
            <s xml:id="echoid-s6274" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6275" xml:space="preserve">Et ſic quidem ei quæ per id tempus aderat phaſi cauſa ſua
              <lb/>
            conſtabat. </s>
            <s xml:id="echoid-s6276" xml:space="preserve">Ergo deinceps expendere cœpi anne reliquæ et-
              <lb/>
            iam, quæ de Saturno ferebantur, eidem annulo imputari
              <lb/>
            poſſent. </s>
            <s xml:id="echoid-s6277" xml:space="preserve">Hoc autem non tardè ſucceſſit ex animadverſa,
              <lb/>
            per frequentes obſervationes, brachiorum Saturni ad eclipti-
              <lb/>
            cam obliquitate. </s>
            <s xml:id="echoid-s6278" xml:space="preserve">Cum enim lineam rectam, ſecundum quam
              <lb/>
            utrinque ea extabant, non ſequi ductum eclipticæ, ſed in-
              <lb/>
            terſecare eam angulo 20 partibus majore comperiſſem, ſta-
              <lb/>
            tui proinde planum annuli quem imaginatus eram tali circi-
              <lb/>
              <note position="right" xlink:label="note-0297-03" xlink:href="note-0297-03a" xml:space="preserve">Eum ad Ec-
                <lb/>
              lipticæ pla-
                <lb/>
              num obliquè
                <lb/>
              poſitum eſſe.</note>
            ter angulo ad eclipticæ planum inclinari. </s>
            <s xml:id="echoid-s6279" xml:space="preserve">Perpetua videli-
              <lb/>
            cet conſtantique inclinatione, quemadmodum in tellure hac
              <lb/>
            noſtra plano æquatoris contingere notum eſt. </s>
            <s xml:id="echoid-s6280" xml:space="preserve">Hinc autem
              <lb/>
            neceſſario illud ſequebatur, ut diverſis aſpectibus nunc el-
              <lb/>
            lipſin ſatis latam, nunc eandem ſtrictiorem, nonnunquam
              <lb/>
            denique & </s>
            <s xml:id="echoid-s6281" xml:space="preserve">rectam lineam idem annulus nobis exhiberet.
              <lb/>
            </s>
            <s xml:id="echoid-s6282" xml:space="preserve">Quod autem anſæ effingerentur, intellexi id inde fieri, quod
              <lb/>
            non arctè Saturni globo annulus cohæreat, ſed pari inter-
              <lb/>
            ſtitio undique ab eo removeatur. </s>
            <s xml:id="echoid-s6283" xml:space="preserve">Quibus proinde ſic ordi-
              <lb/>
            natis, ac præterea adſumta ea quam dixi annuli </s>
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