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

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            <s xml:id="echoid-s6969" xml:space="preserve">
              <pb o="593" file="0329" n="346" rhead="SYSTEMA SATURNIUM."/>
            menſus fuero; </s>
            <s xml:id="echoid-s6970" xml:space="preserve">quod hactenus non ſucceſſit, cum ob exilita-
              <lb/>
            tem ſideris, tum quod horizonti plerumque vicinum inve-
              <lb/>
            niatur, ubi vapores è Terra ſurgentes tremula quadam refra-
              <lb/>
            ctione figuram ejus præciſo ambitu terminari non ſinunt. </s>
            <s xml:id="echoid-s6971" xml:space="preserve">Pa-
              <lb/>
            tet autem & </s>
            <s xml:id="echoid-s6972" xml:space="preserve">Saturnii globi diametrum ad diametrum Jovis ra-
              <lb/>
            tionem habere quam 55 ad 74: </s>
            <s xml:id="echoid-s6973" xml:space="preserve">diametrum vero Martis conti-
              <lb/>
            nere amplius quam vicies & </s>
            <s xml:id="echoid-s6974" xml:space="preserve">bis, ad Veneris diametrum eſſe
              <lb/>
            ut 34 ad 3. </s>
            <s xml:id="echoid-s6975" xml:space="preserve">Jovis item diametrum diametri Martis amplius
              <lb/>
            quam trigecuplam eſſe; </s>
            <s xml:id="echoid-s6976" xml:space="preserve">diametri vero Veneris amplius
              <lb/>
            quam quindecuplam; </s>
            <s xml:id="echoid-s6977" xml:space="preserve">ac denique Martis diam. </s>
            <s xml:id="echoid-s6978" xml:space="preserve">ad diametrum
              <lb/>
            Veneris circiter ſubduplam. </s>
            <s xml:id="echoid-s6979" xml:space="preserve">Quæ omnes proportiones ratæ
              <lb/>
            fixæque permanent, quantacunque diſtantia Solem inter ac
              <lb/>
            Tellurem ſtatuatur, ſi modo apparentes diametri quales tra-
              <lb/>
            didimus retineantur. </s>
            <s xml:id="echoid-s6980" xml:space="preserve">Haſce autem quo modo obſervaveri-
              <lb/>
            mus denique dicendum eſt, atque eo magis quod longè ab
              <lb/>
            aliorum ſententia alicubi recedamus: </s>
            <s xml:id="echoid-s6981" xml:space="preserve">veluti cum Veneris dia-
              <lb/>
            metrum triplo minorem aſſerimus quam à Ricciolo definita
              <lb/>
            eſt, qui tamen ſumma cura circa hæc verſatus videtur. </s>
            <s xml:id="echoid-s6982" xml:space="preserve">No-
              <lb/>
            ſtrum igitur artificium eſt hujuſmodi.</s>
            <s xml:id="echoid-s6983" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6984" xml:space="preserve">Locus quidam eſt intra tubos qui Solis convexis vitris in-
              <lb/>
              <note position="right" xlink:label="note-0329-01" xlink:href="note-0329-01a" xml:space="preserve">Ratio obſer-
                <lb/>
              vandi Pla-
                <lb/>
              netarum dia-
                <lb/>
              metros appa-
                <lb/>
              rentes accu-
                <lb/>
              ratiſſima.</note>
            ſtructi ſunt, circiter altero tanto amplius quàm convexum
              <lb/>
            oculare ab oculo diſtans; </s>
            <s xml:id="echoid-s6985" xml:space="preserve">quo in loco ſi quid intra tubi cavi-
              <lb/>
            tatem viſui objiciatur, quantumvis ſubtile aut exiguum, id di-
              <lb/>
            ſtinctè prorſus ambituque exquiſitè terminato conſpicitur,
              <lb/>
            atque ita pro ratione latitudinis ſuæ partem aliquam rei luci-
              <lb/>
            dæ, velut Lunæ per teleſcopium ſpectatæ, viſui ſubducit.
              <lb/>
            </s>
            <s xml:id="echoid-s6986" xml:space="preserve">Exacta loci determinatio, his quibus nullo vitio viſus labo-
              <lb/>
            rat, in focum convexi ocularis cadit; </s>
            <s xml:id="echoid-s6987" xml:space="preserve">myopi aliquanto pro-
              <lb/>
            pinquius punctum accipiendum eſt, contraque, qui tantum
              <lb/>
            à longinquo clare vident, paulo remotius; </s>
            <s xml:id="echoid-s6988" xml:space="preserve">quod experientia
              <lb/>
            protinus docere poteſt. </s>
            <s xml:id="echoid-s6989" xml:space="preserve">Hîc igitur ſi primò annulus ſtatua-
              <lb/>
            tur cum foramine paulo anguſtiore quam ſit vitrum ipſum o-
              <lb/>
            culo proximum, eo tota tubi apertura, ſive ſpatium circulare
              <lb/>
            quod uno obtutu in cælo detegitur, præcisâ circumſerentiâ
              <lb/>
            deſcriptum habetur. </s>
            <s xml:id="echoid-s6990" xml:space="preserve">Cujus ſpatii diameter, quot ſcrupula
              <lb/>
            comprehendat, aliquo pacto inquirendum eſt, atque </s>
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