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

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          <pb o="210" file="0288" n="315" rhead="CHRIST. HUGENII INSTITUTIO"/>
        </div>
        <div xml:id="echoid-div417" type="section" level="1" n="163">
          <head xml:id="echoid-head197" xml:space="preserve">XI.</head>
          <p>
            <s xml:id="echoid-s4676" xml:space="preserve">Quando videndam ſe offert regio cognita, ne negli-
              <lb/>
            gas annotare longitudinem illius, quantum exacte fieri
              <lb/>
            poterit, ex inventa longitudine loci in quo verſaris; </s>
            <s xml:id="echoid-s4677" xml:space="preserve">Pri-
              <lb/>
            mo ad corrigendas inde mappas marinas, poſtquam longitu-
              <lb/>
            do loci fuerit diverſis temporibus comperta eadem, ita ut
              <lb/>
            nil amplius de ea dubites. </s>
            <s xml:id="echoid-s4678" xml:space="preserve">In his enim mappis quantum atti-
              <lb/>
            net ad ſitum locorum Orientem & </s>
            <s xml:id="echoid-s4679" xml:space="preserve">Occidentem verſus, multa ſu-
              <lb/>
            perſunt emendanda. </s>
            <s xml:id="echoid-s4680" xml:space="preserve">Secundo ut ſcias, in proſecutione tui
              <lb/>
            itineris, quantum reſpectu loci viſi velificando progreſſus
              <lb/>
            fueris ad Orientem vel Occidentem: </s>
            <s xml:id="echoid-s4681" xml:space="preserve">etiamſi infortun@o,
              <lb/>
            vel negligentia, omnia quieſcant Horologia, poteris eadem
              <lb/>
            ad motum rurſus adaptare, & </s>
            <s xml:id="echoid-s4682" xml:space="preserve">diſponere ad horam per So-
              <lb/>
            lem compertam. </s>
            <s xml:id="echoid-s4683" xml:space="preserve">computando porro longitudinem ab ejus-
              <lb/>
            dem loci viſi Meridiano. </s>
            <s xml:id="echoid-s4684" xml:space="preserve">Nam nullatenus teneris certum
              <lb/>
            Meridianum alicujus loci cogniti, pro initio computationis
              <lb/>
            longitudinum habere, cujus uſus tantum eſt in mappis vel
              <lb/>
            Tabulis longitudinum, in quo caſu uſu venit Meridianus
              <lb/>
            montis Pici in inſula Teneriffa, vel Meridianus inſularum
              <lb/>
            Corvo & </s>
            <s xml:id="echoid-s4685" xml:space="preserve">Flores, occidentaliſſimarum Azorum vel inſula-
              <lb/>
            rum Flandricarum, vel cujusvis alterius loci: </s>
            <s xml:id="echoid-s4686" xml:space="preserve">& </s>
            <s xml:id="echoid-s4687" xml:space="preserve">foret egre-
              <lb/>
            gium (quod non obtinet) ſi omnes auctores unum eundem-
              <lb/>
            que Meridianum pro primo eligerent, ut ſingula loca iis-
              <lb/>
            dem gradibus longitudinis pariter ac latitudinis determina-
              <lb/>
            rentur: </s>
            <s xml:id="echoid-s4688" xml:space="preserve">ſed in itinere ſatis eſt longitudinum differentiam ob-
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            ſervare, initio computationis facto a Meridiano cujuscunque
              <lb/>
            loci.</s>
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          <head xml:id="echoid-head198" xml:space="preserve">XII.</head>
          <p>
            <s xml:id="echoid-s4690" xml:space="preserve">Si accidat, ut mari medio omnia Horologia quieſcant,
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            quam primum fieri poteſt, rurſus eadem ad motum </s>
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