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

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        <div xml:id="echoid-div411" type="section" level="1" n="159">
          <pb o="205" file="0283" n="310" rhead="DE USU HOROLOG."/>
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        <div xml:id="echoid-div412" type="section" level="1" n="160">
          <head xml:id="echoid-head193" xml:space="preserve">VIII.</head>
          <head xml:id="echoid-head194" style="it" xml:space="preserve">Quomodo ex obſervatione ortus & occaſus Solis & ex
            <lb/>
          hora horologiorum longitudo mari inveniri
            <lb/>
          queat.</head>
          <p>
            <s xml:id="echoid-s4529" xml:space="preserve">Hæc ſane methodus meo judicio omnium eſt certiſſim@,
              <lb/>
            cum ad eam neque notitia Poli elevationis, neque Solis de-
              <lb/>
            clinationis, neque ulla inſtrumenta ad obſervandum requi-
              <lb/>
            rantur; </s>
            <s xml:id="echoid-s4530" xml:space="preserve">cum neque refractio quid nocere poſſit, quoniam
              <lb/>
            hæc in ortu & </s>
            <s xml:id="echoid-s4531" xml:space="preserve">occaſu Solis ejusdem diei parum aut nihil
              <lb/>
            differre poteſt.</s>
            <s xml:id="echoid-s4532" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4533" xml:space="preserve">Sicuti ergo antea docuimus horologia in naviadaptare, & </s>
            <s xml:id="echoid-s4534" xml:space="preserve">
              <lb/>
            obſervare quâ horâ eorundem horologiorum Sol fuerit in
              <lb/>
            meridiano; </s>
            <s xml:id="echoid-s4535" xml:space="preserve">hic eodem modo procedendum eſt, id eſt, in or-
              <lb/>
            tu & </s>
            <s xml:id="echoid-s4536" xml:space="preserve">occaſu ſolis, ubi ejus medietas eſt ſupra horizontem,
              <lb/>
            annotabis horam demonſtratam tunc temporis per horolo-
              <lb/>
            gia; </s>
            <s xml:id="echoid-s4537" xml:space="preserve">& </s>
            <s xml:id="echoid-s4538" xml:space="preserve">licet interea velificando fueris progreſſus, nil re-
              <lb/>
            fert, uti poſtea demonſtrabitur: </s>
            <s xml:id="echoid-s4539" xml:space="preserve">dein computans quot in-
              <lb/>
            terea horæ horologiorum dilapſæ ſint, earumque dimidium
              <lb/>
            addens ad horam ortus, habebis horam quam horologium
              <lb/>
            indicabat quum Sol erat in Meridiano; </s>
            <s xml:id="echoid-s4540" xml:space="preserve">ad quam addenda eſt
              <lb/>
            æquatio iſtius diei ex tabula deſumta; </s>
            <s xml:id="echoid-s4541" xml:space="preserve">& </s>
            <s xml:id="echoid-s4542" xml:space="preserve">ſi ſumma æqualis
              <lb/>
            ſit 12 horis, fuiſti meridie ſub eodem Meridiano, ſub quo
              <lb/>
            horologia ad ſolem fuere adaptata; </s>
            <s xml:id="echoid-s4543" xml:space="preserve">ſed ſi ſumma excedat 12.
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            </s>
            <s xml:id="echoid-s4544" xml:space="preserve">horas, fuiſti meridie ſub occidentaliori meridiano, quam
              <lb/>
            loci ejus in quo horologia ſunt diſpoſita; </s>
            <s xml:id="echoid-s4545" xml:space="preserve">ſed ſi ſumma fuerit
              <lb/>
            minor 12. </s>
            <s xml:id="echoid-s4546" xml:space="preserve">horis fuiſti ſub orientaliori Meridiano, idque toties
              <lb/>
            quindecim gradibus, quot horis ſumma fuerit minor vel exceſſe-
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            rit 12. </s>
            <s xml:id="echoid-s4547" xml:space="preserve">horas, prout iſtius rei computationem antea jam docuimus.</s>
            <s xml:id="echoid-s4548" xml:space="preserve"/>
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            <s xml:id="echoid-s4549" xml:space="preserve">E. </s>
            <s xml:id="echoid-s4550" xml:space="preserve">G. </s>
            <s xml:id="echoid-s4551" xml:space="preserve">Ponatur Horologia A. </s>
            <s xml:id="echoid-s4552" xml:space="preserve">& </s>
            <s xml:id="echoid-s4553" xml:space="preserve">B, ut ante, fuiſſe ad-
              <lb/>
            aptata ad Solem in loco ex quo deceſſiſti 2. </s>
            <s xml:id="echoid-s4554" xml:space="preserve">Martii, id
              <lb/>
            eſt ad horam Solis diminutam æquatione iſtius diei ſcil. </s>
            <s xml:id="echoid-s4555" xml:space="preserve">2.
              <lb/>
            </s>
            <s xml:id="echoid-s4556" xml:space="preserve">min. </s>
            <s xml:id="echoid-s4557" xml:space="preserve">28. </s>
            <s xml:id="echoid-s4558" xml:space="preserve">ſec. </s>
            <s xml:id="echoid-s4559" xml:space="preserve">Horologio A. </s>
            <s xml:id="echoid-s4560" xml:space="preserve">ad rectam menſuram redacto; </s>
            <s xml:id="echoid-s4561" xml:space="preserve">
              <lb/>
            B. </s>
            <s xml:id="echoid-s4562" xml:space="preserve">vero ſingulis diebus 7. </s>
            <s xml:id="echoid-s4563" xml:space="preserve">ſecundis tardius moto; </s>
            <s xml:id="echoid-s4564" xml:space="preserve">Poſtea
              <lb/>
            ſcire deſiderans longitudinem loci in quem </s>
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