Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica
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          <p>
            <s xml:id="echoid-s5976" xml:space="preserve">
              <pb o="551" file="0283" n="298" rhead="SYSTEMA SATURNIUM."/>
            ces; </s>
            <s xml:id="echoid-s5977" xml:space="preserve">iſque motus ex Ephemeridibus invenitur fuiſſe gr. </s>
            <s xml:id="echoid-s5978" xml:space="preserve">40,
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            48′. </s>
            <s xml:id="echoid-s5979" xml:space="preserve">Sic itaque colligo; </s>
            <s xml:id="echoid-s5980" xml:space="preserve">ſi diebus 1086 abſolvit periodos 68,
              <lb/>
            atque inſuper gr. </s>
            <s xml:id="echoid-s5981" xml:space="preserve">40, 48@, hoc eſt gr. </s>
            <s xml:id="echoid-s5982" xml:space="preserve">24520, 48′, quantum
              <lb/>
            ergo die una? </s>
            <s xml:id="echoid-s5983" xml:space="preserve">Prodeuntque gr. </s>
            <s xml:id="echoid-s5984" xml:space="preserve">22, 34′, 44″, qui motus co-
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            mitis diurnus eſt reſpectu fixarum. </s>
            <s xml:id="echoid-s5985" xml:space="preserve">Ad menſis ſiderei lon-
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            gitudinem inveniendam ita calculum inſtituo; </s>
            <s xml:id="echoid-s5986" xml:space="preserve">ſi gr. </s>
            <s xml:id="echoid-s5987" xml:space="preserve">24520,
              <lb/>
            48′ percurrit diebus 1086, quot dies impendet gradibus 360?
              <lb/>
            </s>
            <s xml:id="echoid-s5988" xml:space="preserve">fiunt dies 15, horæ 22, ſcr. </s>
            <s xml:id="echoid-s5989" xml:space="preserve">39. </s>
            <s xml:id="echoid-s5990" xml:space="preserve">ſpatium quo ad eandem fi-
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            xam Saturni incolis Luna ſua revertitur.</s>
            <s xml:id="echoid-s5991" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5992" xml:space="preserve">Deinde medium motum diurnum à ſole (qui minor eſt
              <lb/>
            motu quo reſpectu fixarum comes progreditur, ut in noſtra
              <lb/>
            quoque Luna evenire novimus) ita reperio; </s>
            <s xml:id="echoid-s5993" xml:space="preserve">Saturni motum
              <lb/>
            medium diurnum qui 2 eſt minutorum, aufero ab invento
              <lb/>
            motu diurno reſpectu fixarum gr. </s>
            <s xml:id="echoid-s5994" xml:space="preserve">22, 34′, 44″. </s>
            <s xml:id="echoid-s5995" xml:space="preserve">unde ſuper-
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            ſunt gr. </s>
            <s xml:id="echoid-s5996" xml:space="preserve">22, 32′, 44″, diurnus motus à Sole. </s>
            <s xml:id="echoid-s5997" xml:space="preserve">Atque hinc
              <lb/>
              <note position="right" xlink:label="note-0283-01" xlink:href="note-0283-01a" xml:space="preserve">Menſis Sa-
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              turnicola-
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              rum vera
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              longitude.</note>
            facile quoque menſis Synodici Saturnicolarum media longi-
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            tudo computatur. </s>
            <s xml:id="echoid-s5998" xml:space="preserve">Nempe ſi gr. </s>
            <s xml:id="echoid-s5999" xml:space="preserve">22, 32′, 44″, uno die per-
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            curruntur, quot igitur diebus gr. </s>
            <s xml:id="echoid-s6000" xml:space="preserve">360? </s>
            <s xml:id="echoid-s6001" xml:space="preserve">Fiuntque dies 15,
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            horæ 23, ſcr. </s>
            <s xml:id="echoid-s6002" xml:space="preserve">13. </s>
            <s xml:id="echoid-s6003" xml:space="preserve">Reliquis duntaxat 47 ſcrupulis ad dies 16.
              <lb/>
            </s>
            <s xml:id="echoid-s6004" xml:space="preserve">Atque illud etiam medium tempus eſt quo noſtri reſpectu ad
              <lb/>
            apogæum ſuum Saturni comes revertitur, ſive intra quod
              <lb/>
            cum Saturno bis conjungitur.</s>
            <s xml:id="echoid-s6005" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6006" xml:space="preserve">Cæterum quia ex motu comitis illud præcipue inveſtigari
              <lb/>
            meretur, quo pacto ad datum quodvis tempus ſitus ejus a-
              <lb/>
            pud Saturnum exhiberi poſſit; </s>
            <s xml:id="echoid-s6007" xml:space="preserve">oſtendemus nunc breviſſimam
              <lb/>
            ad hoc calculi rationem, ſequentium tabularum ope abſol-
              <lb/>
            vendam; </s>
            <s xml:id="echoid-s6008" xml:space="preserve">in quibus motum comitis æqualem qualis ex Satur-
              <lb/>
            no fixarum reſpectu appareret, proponimus. </s>
            <s xml:id="echoid-s6009" xml:space="preserve">Hunc autem
              <lb/>
            diurnum adſumſimus gr. </s>
            <s xml:id="echoid-s6010" xml:space="preserve">22, 34′, 44″, ſicut modo inventus
              <lb/>
            fuit. </s>
            <s xml:id="echoid-s6011" xml:space="preserve">Etſi enim expertus ſum, iterato eodem examine adhi-
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            bitiſque aliis duobus temporibus quibus comes fuit apogæus
              <lb/>
            aut perigæus, aliquot ſecundis ſcrupulis majorem interdum
              <lb/>
            minoremve eundem motum reperiri, iſtum tamen medium quo-
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            dammodo inter alios retineri poſſe ratus ſum, poſt plures ab-
              <lb/>
            hinc elapſos annos facile emendandum. </s>
            <s xml:id="echoid-s6012" xml:space="preserve">Nam & </s>
            <s xml:id="echoid-s6013" xml:space="preserve">inæqualitas
              <lb/>
            puto aliqua, & </s>
            <s xml:id="echoid-s6014" xml:space="preserve">eccentricitas, quemadmodum in Luna noſtra,
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            ita circa hanc quoque, diligenti obſervatione olim deprehen-
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            di poterit.</s>
            <s xml:id="echoid-s6015" xml:space="preserve"/>
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