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

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            <s xml:id="echoid-s7010" xml:space="preserve">
              <pb o="595" file="0331" n="348" rhead="SYSTEMA SATURNIUM."/>
            tiori, appulſu nimirum ad fixas inveſtigavit, eadem fere qua
              <lb/>
            & </s>
            <s xml:id="echoid-s7011" xml:space="preserve">nos amplitudine definiit, paullum tantum excedens: </s>
            <s xml:id="echoid-s7012" xml:space="preserve">Sa-
              <lb/>
            turni enim maximam 72″ continere aſſerit, Jovis item maxi-
              <lb/>
            mam 68″, quæ mihi ſunt 68″ & </s>
            <s xml:id="echoid-s7013" xml:space="preserve">64″. </s>
            <s xml:id="echoid-s7014" xml:space="preserve">Certum autem eſt non
              <lb/>
            magis in Venere, quam in Jove aut Saturno dimetiendis, er-
              <lb/>
            rori obnoxiam eſſe rationem noſtram. </s>
            <s xml:id="echoid-s7015" xml:space="preserve">Et Veneris quidem
              <lb/>
            diametrum Hevelius quoque, ad Lunæ maculas inſtituta com-
              <lb/>
            paratione, tantum 82″ ſe inveniſſe teſtatur cum circa peri-
              <lb/>
            gæum verſaretur, unde diameter ejus maxima non multum ſa-
              <lb/>
            nè noſtram ſuperabit. </s>
            <s xml:id="echoid-s7016" xml:space="preserve">Porro illud in methodo à nobis tra-
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            dita commodiſſimum accidit, quod nec Lunæ, nec ſideris cu-
              <lb/>
            juſquam conjunctionem, cum eo quem metiri volumus pla-
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            neta, opperiri neceſſe eſt, ſed omni tempore ejus uſus con-
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            ceditur. </s>
            <s xml:id="echoid-s7017" xml:space="preserve">Nec ad planetarum tantum diametros pertinet, ſed
              <lb/>
            ad lunares quoque maculas accuratè deſcribendas, comitum-
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            que Jovialium diſtantias accipiendas rectiſſimè adhibebitur.
              <lb/>
            </s>
            <s xml:id="echoid-s7018" xml:space="preserve">Ad planetarum autem diametros longis atque optimæ notæ
              <lb/>
            teleſcopiis opus eſſe ſciendum eſt. </s>
            <s xml:id="echoid-s7019" xml:space="preserve">Nec negligendum in Ve-
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            nere ac Mercurio, ut fuligine leviter inficiatur lens oculo pro-
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            xima, quo perfectius planetæ ambitus circùm terminetur.</s>
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        <div xml:id="echoid-div359" type="section" level="1" n="143">
          <head xml:id="echoid-head193" xml:space="preserve">FINIS.</head>
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