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

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            <s xml:id="echoid-s951" xml:space="preserve">
              <pb o="42" file="0068" n="69" rhead="CHRISTIANI HUGENII"/>
            absque errore, oculus ad idem punctum reponi poſſit. </s>
            <s xml:id="echoid-s952" xml:space="preserve">Jam
              <lb/>
              <note position="left" xlink:label="note-0068-01" xlink:href="note-0068-01a" xml:space="preserve">
                <emph style="sc">Descri-</emph>
                <lb/>
                <emph style="sc">PTIO</emph>
                <emph style="sc">Ho-</emph>
                <lb/>
                <emph style="sc">ROLOGII</emph>
              .</note>
            ad momentum ipſum, cum ſtellarum aliqua è conſpectu abit,
              <lb/>
            notetur tempus horologio indicatum. </s>
            <s xml:id="echoid-s953" xml:space="preserve">Atque idem poſtero
              <lb/>
            die, vel potius aliquot diebus intermiſſis, fiat. </s>
            <s xml:id="echoid-s954" xml:space="preserve">Quod ſi
              <lb/>
            tantum unius diei ſpatium duabus obſervationibus interceſſe-
              <lb/>
            rit, oportet in poſtrema obſervatione tempus horologii de-
              <lb/>
            ficere ab illo, quod prima obſervatione annotatum fuerat,
              <lb/>
            ſcrupulis primis 3, ſecundis 56. </s>
            <s xml:id="echoid-s955" xml:space="preserve">Ita enim rectè ſe habere
              <lb/>
            perpendiculi longitudinem conſtabit; </s>
            <s xml:id="echoid-s956" xml:space="preserve">quum tanto ſuperetur
              <lb/>
            quælibet ſiderum fixorum revolutio à die ſolari mediocri.
              <lb/>
            </s>
            <s xml:id="echoid-s957" xml:space="preserve">Mediocri dico, quoniam dies ſolares, de meridie ad meri-
              <lb/>
            diem, non omnes inter ſe æquales ſunt, ut mox amplius
              <lb/>
            exponetur. </s>
            <s xml:id="echoid-s958" xml:space="preserve">Si vero poſt plures demum dies obſervatio re-
              <lb/>
            petatur, in ſingulos tantundem differentiæ cauſa computan-
              <lb/>
            dum erit. </s>
            <s xml:id="echoid-s959" xml:space="preserve">Sit, exempli gratiâ, in prima obſervatione, ad
              <lb/>
            momentum evaneſcentis ſtellæ, adnotata horologii hora 9,
              <lb/>
            cum ſcrupulis primis 30, ſecundis 18; </s>
            <s xml:id="echoid-s960" xml:space="preserve">deinde, ſeptimo
              <lb/>
            poſt die, eâdem diſparente ſtellâ, indicet horam 8, cum
              <lb/>
            ſcrupulis pr. </s>
            <s xml:id="echoid-s961" xml:space="preserve">50, ſec. </s>
            <s xml:id="echoid-s962" xml:space="preserve">24. </s>
            <s xml:id="echoid-s963" xml:space="preserve">Hæc hora deficit à priore ſcrupu-
              <lb/>
            lis pr. </s>
            <s xml:id="echoid-s964" xml:space="preserve">39, ſecundis 54. </s>
            <s xml:id="echoid-s965" xml:space="preserve">Quæ, in ſeptem diviſa, dant retar-
              <lb/>
            dationem diurnam ſcrupulorum 5′. </s>
            <s xml:id="echoid-s966" xml:space="preserve">42″. </s>
            <s xml:id="echoid-s967" xml:space="preserve">Debebat autem eſſe
              <lb/>
            ſcrupulorum 3′.</s>
            <s xml:id="echoid-s968" xml:space="preserve">56″. </s>
            <s xml:id="echoid-s969" xml:space="preserve">quæ illâ minor eſt ſcrupulis 1′.</s>
            <s xml:id="echoid-s970" xml:space="preserve">46″. </s>
            <s xml:id="echoid-s971" xml:space="preserve">Ita-
              <lb/>
            que tantundem quotidie deficit horologium à vera, ſeu me-
              <lb/>
            dia, dierum menſura.</s>
            <s xml:id="echoid-s972" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s973" xml:space="preserve">Cæterum alio quoque modo, ad ſolem, horologii motum
              <lb/>
            examinare licebit. </s>
            <s xml:id="echoid-s974" xml:space="preserve">Sed hic jam inæqualitatis dierum natu-
              <lb/>
            ralium ratio habenda erit. </s>
            <s xml:id="echoid-s975" xml:space="preserve">Sunt enim, ut jam dixi, non
              <lb/>
            omnes ejusmodi dies inter ſe æquales; </s>
            <s xml:id="echoid-s976" xml:space="preserve">& </s>
            <s xml:id="echoid-s977" xml:space="preserve">quanquam exi-
              <lb/>
            guum ſit diſcrimen, tamen plurium dierum intervallo ſæpe
              <lb/>
            eo usque excreſcit, ut haudquaquam contemni poſſit. </s>
            <s xml:id="echoid-s978" xml:space="preserve">Ete-
              <lb/>
            nim ſi & </s>
            <s xml:id="echoid-s979" xml:space="preserve">ſolarium quam perfectiſſime deſcriptum habeatur,
              <lb/>
            & </s>
            <s xml:id="echoid-s980" xml:space="preserve">horologii automati motus ad veriſſimam dierum menſu-
              <lb/>
            ram exactus ſit, neque ab ea recedat; </s>
            <s xml:id="echoid-s981" xml:space="preserve">eveniet tamen neceſ-
              <lb/>
            ſario ut, certis anni temporibus, ſæpe horæ quadrante, aut
              <lb/>
            etiam ſemihora, inter ſe diſcrepent, ac rurſus ſtatis tempo-
              <lb/>
            ribus ultro concordent. </s>
            <s xml:id="echoid-s982" xml:space="preserve">Hoc enim ita eſſe, ex tabula </s>
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