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

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            <s xml:id="echoid-s4374" xml:space="preserve">
              <pb o="200" file="0278" n="305" rhead="CHRIST. HUGENII INSTITUTIO"/>
            demonſtrationem etiam revera exactis Pendulis compertum
              <lb/>
            eſt, quod ad inæqualitatem dierum ad rectam menſuram re-
              <lb/>
            ducendam, æquatio, prout eam hic per præcedentem Ta-
              <lb/>
            bulam inſtituimus, exacte cum experientia conveniat, ita ut
              <lb/>
            tuto ei confidere liceat. </s>
            <s xml:id="echoid-s4375" xml:space="preserve">Idque tanti momenti eſt in inve-
              <lb/>
            niendis longitudinibus, ut, ſi non fuerit obſervatum, non-
              <lb/>
            nunquam ſpatio 3 menſium in calculo errorem committas 7
              <lb/>
            graduum & </s>
            <s xml:id="echoid-s4376" xml:space="preserve">amplius, ſine ulla tamen horologiorum culpa:
              <lb/>
            </s>
            <s xml:id="echoid-s4377" xml:space="preserve">qui gradus ſub Tropicis ultra 100 Germanica milliaria conti-
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            nent.</s>
            <s xml:id="echoid-s4378" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4379" xml:space="preserve">Oſtenſo, quomodo horologia poſſint adaptari terrâ, vel
              <lb/>
            quomodo eorum differentia quotidiana ſit invenienda, pro-
              <lb/>
            ximum erit dicere, quomodo idem faciendum ſit in navi fixa
              <lb/>
            ad anchoram, cum minime poſſibile ſit idem præſtare in ve-
              <lb/>
            lificatione.</s>
            <s xml:id="echoid-s4380" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4381" xml:space="preserve">Obſervabimus quodam die ortum & </s>
            <s xml:id="echoid-s4382" xml:space="preserve">occaſum Solis, & </s>
            <s xml:id="echoid-s4383" xml:space="preserve">in
              <lb/>
            utraque obſervatione ubi ejus medietas exacte ſupra Horizon-
              <lb/>
            tem apparet, notabimus horam quam indicat horologium,
              <lb/>
            & </s>
            <s xml:id="echoid-s4384" xml:space="preserve">ſupputabimus quot horæ interea fuerint præteritæ, cujus
              <lb/>
            numeri dimidio addito ad horam obſervationis matutinæ,
              <lb/>
            habebimus horam quam indicavit horologium cum Sol eſ-
              <lb/>
            ſet in meridiano: </s>
            <s xml:id="echoid-s4385" xml:space="preserve">cui addens Tabulæ æquationem iſtius diei,
              <lb/>
            ſummam notabimus, & </s>
            <s xml:id="echoid-s4386" xml:space="preserve">horologium ulterius promoveri pa-
              <lb/>
            tiemur. </s>
            <s xml:id="echoid-s4387" xml:space="preserve">dein quibusdam diebus, elapſis (quo autem plures
              <lb/>
            præterierint, eo melius eſt) idem omnino faciemus; </s>
            <s xml:id="echoid-s4388" xml:space="preserve">Et ſi
              <lb/>
            hora hujus ultimi diei ſit eadem, cum ea quæ antea fuerat
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            notata, horologium recte accommodatum eſt. </s>
            <s xml:id="echoid-s4389" xml:space="preserve">Sin vero ma-
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            jor vel minor ſit, vel lentius vel celerius movetur, & </s>
            <s xml:id="echoid-s4390" xml:space="preserve">diffe-
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            rentia diviſa per numerum dierum interim dilapſarum dabit
              <lb/>
            quotidianam differentiam, quam annotabimus, & </s>
            <s xml:id="echoid-s4391" xml:space="preserve">ſi velimus
              <lb/>
            horologium relinquemus in illo ſtatu; </s>
            <s xml:id="echoid-s4392" xml:space="preserve">vel alioquin remo-
              <lb/>
            vendo minus pondus penduli ut ſupra dictum eſt, melius
              <lb/>
            horologium accommodabimus.</s>
            <s xml:id="echoid-s4393" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4394" xml:space="preserve">Ex. </s>
            <s xml:id="echoid-s4395" xml:space="preserve">Gr. </s>
            <s xml:id="echoid-s4396" xml:space="preserve">pone 21. </s>
            <s xml:id="echoid-s4397" xml:space="preserve">Martii mane cum ſolis medie-
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              <note position="right" xlink:label="note-0278-01" xlink:href="note-0278-01a" xml:space="preserve">
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              h. # m. # ſ.
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              5. # 30. # 10.
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              5. # 20. # 6.
                <lb/>
              </note>
            tas apparet ſupra horizontem horologium indicare.
              <lb/>
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            <s xml:id="echoid-s4398" xml:space="preserve">Et veſperi ubiSolis medietas latet infra horizontem.</s>
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