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

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        <div xml:id="echoid-div308" type="section" level="1" n="142">
          <p>
            <s xml:id="echoid-s6574" xml:space="preserve">
              <pb o="578" file="0312" n="328" rhead="CHRIST. HUGENII"/>
            ut illa propius ad eam accedat, ut cum ille eſt in N, hæc in
              <lb/>
            F: </s>
            <s xml:id="echoid-s6575" xml:space="preserve">vel cum diverſas partes reſpectu A C obtinent, velut cum
              <lb/>
            Saturnus eſt in N, Tellus in f; </s>
            <s xml:id="echoid-s6576" xml:space="preserve">utroque caſu linea interſe-
              <lb/>
            ctionis annuli atque orbitæ Saturni, ut hîc N Q, quæ ni-
              <lb/>
            mirum ipſi A C æquidiſtans acta eſt, Terram Solemque ab
              <lb/>
            eadem parte habebit. </s>
            <s xml:id="echoid-s6577" xml:space="preserve">Unde intelligitur, utrovis poſitu
              <lb/>
            eandem annuli ſuperficiem à Sole & </s>
            <s xml:id="echoid-s6578" xml:space="preserve">nobis aſpici: </s>
            <s xml:id="echoid-s6579" xml:space="preserve">quod re-
              <lb/>
            quiri jam ſupra advertimus, ut brachia Saturni aut anſæ ap-
              <lb/>
            parere poſſint. </s>
            <s xml:id="echoid-s6580" xml:space="preserve">Quanquam ne ſic quidem ſemper cernuntur,
              <lb/>
            uti poſtea manifeſtum fiet.</s>
            <s xml:id="echoid-s6581" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6582" xml:space="preserve">Hi autem diverſi ſitus ut ex tabulis Aſtronomicis parvo
              <lb/>
              <note position="left" xlink:label="note-0312-01" xlink:href="note-0312-01a" xml:space="preserve">Saturnus
                <lb/>
              quando ne-
                <lb/>
              ceſſario ro-
                <lb/>
              tundus ſpe-
                <lb/>
              ctari debeat.</note>
            negotio cognoſcantur, indeque rotunda phaſis, quatenus
              <lb/>
            ab hac cauſa pendet, prædici poſſit, ſciendum eſt, quan-
              <lb/>
            docunque Saturni locus apparens locuſque ex Sole ſive ec-
              <lb/>
            centricus, diverſas partes obtinent ejus loci quem inter fi-
              <lb/>
            xas deſignat recta A C, (quam in gr. </s>
            <s xml:id="echoid-s6583" xml:space="preserve">20 {1/2} ♍ & </s>
            <s xml:id="echoid-s6584" xml:space="preserve">♓ incidere
              <lb/>
            poſt hæc oſtendemus) id ejuſmodi ſitum Saturni ac Telluris
              <lb/>
            indicare qualis in H & </s>
            <s xml:id="echoid-s6585" xml:space="preserve">D, ut nimirum ab eadem parte am-
              <lb/>
            bo reperiantur rectæ A C, atque propior huic Saturnus con-
              <lb/>
            ſiſtat; </s>
            <s xml:id="echoid-s6586" xml:space="preserve">eoque tunc rotundam phaſin conſpiciendam dari. </s>
            <s xml:id="echoid-s6587" xml:space="preserve">Il-
              <lb/>
            lo enim poſito, ſit Saturnus in H. </s>
            <s xml:id="echoid-s6588" xml:space="preserve">Primùm itaque dico ab
              <lb/>
            hac parte lineæ A C etiam Tellurem conſiſtere. </s>
            <s xml:id="echoid-s6589" xml:space="preserve">Etenim ſi
              <lb/>
            ad alteram partem ſita eſſe dicatur, velut in P; </s>
            <s xml:id="echoid-s6590" xml:space="preserve">liquet rectam
              <lb/>
            ex P ad H ductam & </s>
            <s xml:id="echoid-s6591" xml:space="preserve">verſus ſixas porro continuatam, quæ
              <lb/>
            locum Saturni apparentem, itemque rectam L H, quæ pro-
              <lb/>
            ducta locum ejus ex Sole demonſtrat, ab eadem parte pun-
              <lb/>
            cti æquinoctiorum, quod L A producta inter fixas determi-
              <lb/>
            nat, utraque ea loca exhibituras; </s>
            <s xml:id="echoid-s6592" xml:space="preserve">contra quàm poſitum fue-
              <lb/>
            rat. </s>
            <s xml:id="echoid-s6593" xml:space="preserve">Eſt ergo Tellus neceſſario ab eadem parte lineæ A C,
              <lb/>
            qua Saturnus H. </s>
            <s xml:id="echoid-s6594" xml:space="preserve">Eſto jam ea alicubi puta in D. </s>
            <s xml:id="echoid-s6595" xml:space="preserve">Quoniam
              <lb/>
            igitur D H ad fixas protracta locum Saturni apparentem de-
              <lb/>
            ſignat, L H vero, uti diximus, locum ejus eccentricum,
              <lb/>
            inter quæ loca intercedere ponitur locus æquinoctiorum quò
              <lb/>
            tendit L A, neceſſe eſt rectam D H tandem ipſam L A in-
              <lb/>
            terſecare, ideoque punctum D, locum videlicet Telluris,
              <lb/>
            amplius diſtare à linea A C quam punctum H in quo </s>
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