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

Table of Notes

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              <pb o="577" file="0311" n="327" rhead="SYSTEMA SATURNIUM."/>
            nea. </s>
            <s xml:id="echoid-s6556" xml:space="preserve">Sic in lunari quoque diſco maculas aliquas, cæteris
              <lb/>
            partibus multo obſcuriores, cernimus; </s>
            <s xml:id="echoid-s6557" xml:space="preserve">quæ quidem non
              <lb/>
            planè omni luce defectæ apparent, verùm ſi æquè procul
              <lb/>
            ac Saturnus à Sole diſtarent, ubi tantum centeſimam partem
              <lb/>
            ejus, quod nunc accipiunt, luminis ab illo mutuarentur,
              <lb/>
            credibile eſt penitus nobis inviſibiles fore, niſi quatenus lu-
              <lb/>
            cidioribus undique terminantur; </s>
            <s xml:id="echoid-s6558" xml:space="preserve">præſertim ſi tenuem modo
              <lb/>
            lineam, ut Saturnii annuli margo, conſtituerent. </s>
            <s xml:id="echoid-s6559" xml:space="preserve">Alioqui
              <lb/>
            vel illud forſitan dici poſſit, materiam quandam aquæ ſimi-
              <lb/>
            lem, aut certè lævi & </s>
            <s xml:id="echoid-s6560" xml:space="preserve">ſplendida ſuperſicie præditam, extre-
              <lb/>
            ma annuli præcingere, quæ unico tantum veluti puncto Solis
              <lb/>
            radios reflectens, nequaquam nobis conſpicua erit, ut ra-
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            tionibus opticis clarum eſt.</s>
            <s xml:id="echoid-s6561" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6562" xml:space="preserve">Sed quæ ad rotundam phaſin attinent ulterius etiam ex-
              <lb/>
            pendamus, in qua plura animadvertenda ſuperſunt. </s>
            <s xml:id="echoid-s6563" xml:space="preserve">Dixi-
              <lb/>
            mus paulò ante, tunc eam potiſſimum exiſtere, cum produ-
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            ctum annuli planum inter nos Solemque medium tranſit.
              <lb/>
            </s>
            <s xml:id="echoid-s6564" xml:space="preserve">Hoc verò quando contingat, quo pacto cognoſcere poſſi-
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            mus, atque ex Aſtronomicis tabulis deſinire, deinceps ex-
              <lb/>
            plicandum eſt. </s>
            <s xml:id="echoid-s6565" xml:space="preserve">Sit itaque denuo Saturni orbita A B C, Tel-
              <lb/>
              <note position="right" xlink:label="note-0311-01" xlink:href="note-0311-01a" xml:space="preserve">TAB. @.
                <lb/>
              fig. 4.</note>
            luris annua D E F, locus ſolis L.</s>
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          </p>
          <p>
            <s xml:id="echoid-s6567" xml:space="preserve">Jam quia poſitum fuit, Saturni axem, qui ad annuli pla-
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            num erectus eſt, ſemper ſibi parallelum ferri, ſequitur com-
              <lb/>
            munem quoque planorum annuli & </s>
            <s xml:id="echoid-s6568" xml:space="preserve">orbitæ interſectionem
              <lb/>
            uni cuidam lineæ ſemper fore parallelam. </s>
            <s xml:id="echoid-s6569" xml:space="preserve">Eſto ea linea per
              <lb/>
            Solem ducta A C, quæ proinde in cælo locum Saturni æ-
              <lb/>
            quinoctiorum deſignabit. </s>
            <s xml:id="echoid-s6570" xml:space="preserve">Poſito igitur Saturno in H,
              <lb/>
            Tellure verò in D, utroque ad partem eandem rectæ A C,
              <lb/>
            verum ita ut minus ab ea Saturnus quam Tellus diſtet: </s>
            <s xml:id="echoid-s6571" xml:space="preserve">ne-
              <lb/>
            ceſſario interſectionis linea planorum annuli & </s>
            <s xml:id="echoid-s6572" xml:space="preserve">orbitæ Satur-
              <lb/>
            ni H M, quæ nimirum ex H parallela ducitur A C inter So-
              <lb/>
            lem L, Terramque in D poſitam excurret, ac propterea an-
              <lb/>
            nuli quoque planum manifeſtò inter utrumque medium in-
              <lb/>
            cedet. </s>
            <s xml:id="echoid-s6573" xml:space="preserve">Quod ubi contingit, rotundæ phaſi locum eſſe
              <lb/>
            demonſtravimus. </s>
            <s xml:id="echoid-s6574" xml:space="preserve">Contra verò, cum Saturnus quidem ac
              <lb/>
            Tellus ad eandem partem rectæ A C conſiſtunt, verum </s>
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