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

Table of figures

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            ſi ſcire libeat quali angulo Solis radii in ſuperficiem annuli
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            deferantur; </s>
            <s xml:id="echoid-s6676" xml:space="preserve">quærendum in tabula declinationis Eclipticæ,
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            qualis apud Aſtronomos in uſu eſt, quanta ſit declinatio
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            loci alicujus qui tantundem à princ. </s>
            <s xml:id="echoid-s6677" xml:space="preserve">Arietis abſit. </s>
            <s xml:id="echoid-s6678" xml:space="preserve">Ea enim
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            eſt ipſe angulus quæſitus. </s>
            <s xml:id="echoid-s6679" xml:space="preserve">Ac ſimili quoque ratione cum
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            data erit diſtantia loci Saturni apparentis ab æquinoctio ſuo,
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            hoc eſt, à gr. </s>
            <s xml:id="echoid-s6680" xml:space="preserve">20{1/2} ♍ aut ♓, invenire licebit quonam angu-
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            lo deſuper planum annuli nos inſpectemus; </s>
            <s xml:id="echoid-s6681" xml:space="preserve">qualemque pro-
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            pterea ellipſin ille nobis exhibere debeat. </s>
            <s xml:id="echoid-s6682" xml:space="preserve">Ex eadem nimi-
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            rum tabula capiendo declinationem huic diſtantiæ à pr. </s>
            <s xml:id="echoid-s6683" xml:space="preserve">A-
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            rietis reſpondentem, quæ declinatio rurſus hîc quæſitum
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            angulum æquat. </s>
            <s xml:id="echoid-s6684" xml:space="preserve">Quorum demonſtrationem adferre operæ
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            pretium non eſt, quippe quam Aſtronimiæ periti facile per-
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            ſpicient.</s>
            <s xml:id="echoid-s6685" xml:space="preserve"/>
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            <s xml:id="echoid-s6686" xml:space="preserve">Illud verò videndum, qui evenerit ut viſu noſtro ac Sole
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            ſimul ſupra planum annuli plus quam 2 gr. </s>
            <s xml:id="echoid-s6687" xml:space="preserve">altis, nullum ta-
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            men brachiorum apud Saturnum veſtigium apparuerit. </s>
            <s xml:id="echoid-s6688" xml:space="preserve">An-
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            ne hæc fortaſſe cauſa fuit quod ellipſis annuli, tam obliquè
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            inſpecta ut magis tenuiſſimæ lineæ ſimilitudinem præferret,
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            exiliorem lucem emittebat quam quæ Galilæi tubo percipi
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            poſſet. </s>
            <s xml:id="echoid-s6689" xml:space="preserve">Hoc quidem non improbabile videri queat, niſi
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            eodem tubo, circa ſolſtitium ejuſdem anni 1612, brachia
              <lb/>
            Saturni ſive bini illi, ut tum putabant, ſatellites Galilæo a-
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            nimadverſi fuiſſent, quo tempore Saturnus obſervabatur
              <lb/>
            circa gr. </s>
            <s xml:id="echoid-s6690" xml:space="preserve">18, ♓. </s>
            <s xml:id="echoid-s6691" xml:space="preserve">hoc eſt gr. </s>
            <s xml:id="echoid-s6692" xml:space="preserve">2{1/2} ab æquinoctio ſuo remotus,
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            ideoque viſus noſter vix uno gradu plano annuli ſuperior.
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            </s>
            <s xml:id="echoid-s6693" xml:space="preserve">Etenim ſi hoc poſitu brachia cerni potuere, multo clarius
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            cerni debuiſſent tunc cum gr. </s>
            <s xml:id="echoid-s6694" xml:space="preserve">2. </s>
            <s xml:id="echoid-s6695" xml:space="preserve">15′ ſupra idem planum vi-
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            ſus extolleretur, initio nimirum Septembr. </s>
            <s xml:id="echoid-s6696" xml:space="preserve">magiſque etiam
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            14 Nov. </s>
            <s xml:id="echoid-s6697" xml:space="preserve">ejuſdem anni 1612, tempore ſtationis Saturni; </s>
            <s xml:id="echoid-s6698" xml:space="preserve">
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            quia tunc gr. </s>
            <s xml:id="echoid-s6699" xml:space="preserve">11. </s>
            <s xml:id="echoid-s6700" xml:space="preserve">10′ ♓ tenebat, eoque gr. </s>
            <s xml:id="echoid-s6701" xml:space="preserve">9. </s>
            <s xml:id="echoid-s6702" xml:space="preserve">20′ ab æqui-
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            noctio ſuo aberat; </s>
            <s xml:id="echoid-s6703" xml:space="preserve">adeo ut angulo gr. </s>
            <s xml:id="echoid-s6704" xml:space="preserve">3. </s>
            <s xml:id="echoid-s6705" xml:space="preserve">42′ radii viſus in
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            planum annuli deſcenderent. </s>
            <s xml:id="echoid-s6706" xml:space="preserve">Atqui hîc, vel certe circa
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            hæc loca brachiorum expers manſit, quum ſatis utique dili-
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            gentem ac intentum obſervationibus Galilæum fuiſſe per eos
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            dies credibile ſit, qui rotundæ phaſeos miraculo nuper eſſet
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            excitatus.</s>
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