Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 1: Opera mechanica

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        <div xml:id="echoid-div412" type="section" level="1" n="160">
          <pb o="209" file="0287" n="314" rhead="DE USU HOROLOG."/>
          <p>
            <s xml:id="echoid-s4658" xml:space="preserve">Præſcriptis ergo modis, vel per ortum & </s>
            <s xml:id="echoid-s4659" xml:space="preserve">occaſum Solis,
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            vel per occaſum & </s>
            <s xml:id="echoid-s4660" xml:space="preserve">ortum Solis, vel per 2 æquales Solis altitu-
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            dines, tuto ſemper uti poſſumus, non obſtante progreſſu
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            navium; </s>
            <s xml:id="echoid-s4661" xml:space="preserve">quemcunque hæ teneant curſum.</s>
            <s xml:id="echoid-s4662" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4663" xml:space="preserve">Si autem procul ab Æquatore Septentrionem vel Meri-
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            diem verſus naviges, præſertim hyeme, altitudo Solis lente
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            mutatur, unde incertæ ſunt obſervationes; </s>
            <s xml:id="echoid-s4664" xml:space="preserve">ſed iis in locis
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            gradus longitudinis ſunt breviores, vel pauciora milliaria
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            continent quam prope Æquatorem, ideoque errores in in-
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            veniendis longitudinibus eo minus ſenſibiles ſunt.</s>
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        <div xml:id="echoid-div415" type="section" level="1" n="161">
          <head xml:id="echoid-head195" xml:space="preserve">IX.</head>
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            <s xml:id="echoid-s4666" xml:space="preserve">Potes verò, præſertim in iis oris, quæ procul ab Æqua-
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            tore Septentrionem vel Auſtrum verſus remotæ ſunt, vel
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            etiam ubicunque velis, præſcriptam regulam ad praxin vo-
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            care, obſervando 2 æquales altitudines cognitæ alicujus ſtel-
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            læ, quæ multum attollitur ſupra Horizontem. </s>
            <s xml:id="echoid-s4667" xml:space="preserve">Nam inde
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            ſecundum memoratam regulam, diſces quâ horâ Horologio-
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            rum in Meridiano fuerit ſtella, & </s>
            <s xml:id="echoid-s4668" xml:space="preserve">porro cognita ejuſdem
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            aſcenſione recta, ut & </s>
            <s xml:id="echoid-s4669" xml:space="preserve">aſcenſione recta Solis, facile inde ſup-
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            putabis horam ſolarem, qua comparatâ cum horâ Horolo-
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            giorum, ut ante, habebis longitudinem loci, ubi fuiſti ſtella
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            exiſtente in Meridiano.</s>
            <s xml:id="echoid-s4670" xml:space="preserve"/>
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        <div xml:id="echoid-div416" type="section" level="1" n="162">
          <head xml:id="echoid-head196" xml:space="preserve">X.</head>
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            <s xml:id="echoid-s4671" xml:space="preserve">Quando Horologia, quorum aliquamdiu motus fuit accu-
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            ratus, ab invicem paululum differunt, prout diuturnitate
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            temporis facile accidit, ut unum vel alterum minuto cir-
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            citer deficiat, eo in caſu computatio ineunda eſt erit ſe-
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            cundum iſtud, quod celerius movetur: </s>
            <s xml:id="echoid-s4672" xml:space="preserve">niſi noris cauſam
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            veriſimilem ob quam citius moveatur; </s>
            <s xml:id="echoid-s4673" xml:space="preserve">facilius enim Pendu-
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            li motus retardatur, quàm acceleratur: </s>
            <s xml:id="echoid-s4674" xml:space="preserve">nam filum, cui Pen-
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            dulum appendet, poterit forſan per violentam navis agitatio-
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            nem nonnihil extendi, ſed nequit contrahi.</s>
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