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

Table of handwritten notes

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            <s xml:id="echoid-s6506" xml:space="preserve">
              <pb o="575" file="0309" n="325" rhead="SYSTEMA SATURNIUM."/>
            guus, vix puto obſervabilis erit: </s>
            <s xml:id="echoid-s6507" xml:space="preserve">aliis autem locis multo mi-
              <lb/>
            nus. </s>
            <s xml:id="echoid-s6508" xml:space="preserve">Nam iis quidem quæ quadrante Zodiaci inde abſunt,
              <lb/>
            nempe cum gr. </s>
            <s xml:id="echoid-s6509" xml:space="preserve">25. </s>
            <s xml:id="echoid-s6510" xml:space="preserve">15′. </s>
            <s xml:id="echoid-s6511" xml:space="preserve">♍ aut ♓ Saturnus obtinebit, prorſus
              <lb/>
            parallela æquatori eadem anſarum linea conſpicictur. </s>
            <s xml:id="echoid-s6512" xml:space="preserve">Eclipti-
              <lb/>
            cæ vero parallela fiet Saturno gr. </s>
            <s xml:id="echoid-s6513" xml:space="preserve">20{1/2} ♊ aut ♐ tenente: </s>
            <s xml:id="echoid-s6514" xml:space="preserve">quip-
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            pe quam in locis per quadrantem circuli inde diſtantibus,
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            nempe in gr. </s>
            <s xml:id="echoid-s6515" xml:space="preserve">20{1/2} ♍ & </s>
            <s xml:id="echoid-s6516" xml:space="preserve">♓, maximo angulo interſecat. </s>
            <s xml:id="echoid-s6517" xml:space="preserve">Hunc
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            autem maximum angulum quo linea anſarum eclipticam in-
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            terſecat eſſe circiter gr. </s>
            <s xml:id="echoid-s6518" xml:space="preserve">23{1/2} obſervationibus anni 1655, 1656
              <lb/>
            & </s>
            <s xml:id="echoid-s6519" xml:space="preserve">1657 apparuit, talemque ad iſta ſupputanda adſumſimus.
              <lb/>
            </s>
            <s xml:id="echoid-s6520" xml:space="preserve">Fortaſſe autem, longo ſæculorum lapſu, ſenſim omnia hæc
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            loca mutari continget, ſimili quodam motu Saturni globum
              <lb/>
            inclinante atque in Tellure noſtra eſt is qui præceſſiones æ-
              <lb/>
            quinoctiorum efficit: </s>
            <s xml:id="echoid-s6521" xml:space="preserve">atque ita phaſium quoque omnium lo-
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            ca transferri neceſſe erit. </s>
            <s xml:id="echoid-s6522" xml:space="preserve">Hoc verò non tam facile in cæ-
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            teris phaſibus quam in rotunda pateſcet, ad cujus conſide-
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            rationem deinceps veniendum.</s>
            <s xml:id="echoid-s6523" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6524" xml:space="preserve">Schema itaque repetenti manifeſtum eſt Saturnum in-
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              <note position="right" xlink:label="note-0309-01" xlink:href="note-0309-01a" xml:space="preserve">Rotundæ
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              phaſeos cau-
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              ſæ.</note>
            tegro orbitæ ſuæ circuitu non poſſe non ad eum locum bis
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            pervenire, (eſto in B & </s>
            <s xml:id="echoid-s6525" xml:space="preserve">D) ubi planum annuli recta ad nos
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            dirigatur, productumque in oculos noſtros incurrat. </s>
            <s xml:id="echoid-s6526" xml:space="preserve">Quod
              <lb/>
            quidem in locis è diametro oppoſitis contingeret, inque iiſ-
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            dem perpetuò, ſi ex Sole Saturni motum proſpiceremus; </s>
            <s xml:id="echoid-s6527" xml:space="preserve">at
              <lb/>
            nunc propter motum Terræ in ſua orbita annuum, nonnul-
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            la oritur inæqualitas. </s>
            <s xml:id="echoid-s6528" xml:space="preserve">Annulo igitur ſecundum latus inſpe-
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            cto, nec niſi rectam lineam referente, quum neutra plana-
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            rum ejus ſuperficierum appareat, ad nihilum rediguntur bra-
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            chia ac prorſus intereunt, ſolo rotundo Saturni corpore
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            quod intueamur reliquo. </s>
            <s xml:id="echoid-s6529" xml:space="preserve">Cujus phænomeni primum teſtem
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            Galilæum ſupra commemoravimus, qui anno 1612 ſimpli-
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            cem hanc Saturni formam obſervaverit. </s>
            <s xml:id="echoid-s6530" xml:space="preserve">Inde verò poſt an-
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            nos 30 Gaſſendum alioſque complures; </s>
            <s xml:id="echoid-s6531" xml:space="preserve">ac nos etiam deni-
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            que anno 1656. </s>
            <s xml:id="echoid-s6532" xml:space="preserve">Verùm enim ſi hôc tantum annuli poſitu
              <lb/>
            anſæ evaneſcerent, nequaquam tanto tempore perſtare ro-
              <lb/>
            tunda phaſis poſſet atque obſervationes teſtantur, toto enim
              <lb/>
            ſemeſtri rotundus Saturnus ſpectatus fuit. </s>
            <s xml:id="echoid-s6533" xml:space="preserve">Quamobrem </s>
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