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

Table of Notes

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            vationis uno gradu Orientalior eſt, quam matutinæ cer-
              <lb/>
            tum eſt in loco veſpertinæ obſervationis Solem 4. </s>
            <s xml:id="echoid-s4628" xml:space="preserve">minuta
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            prius perventurum eſſe, ad altitudinem 10. </s>
            <s xml:id="echoid-s4629" xml:space="preserve">graduum, quam in
              <lb/>
            loco matutinæ. </s>
            <s xml:id="echoid-s4630" xml:space="preserve">Duorum enim locorum ſub eodem paralelo
              <lb/>
            ſitorum, quot gradus unus altero Orientalior eſt, totidem
              <lb/>
            4. </s>
            <s xml:id="echoid-s4631" xml:space="preserve">minutis prius in illo obſervantur ſingulæ Solis altitudines;
              <lb/>
            </s>
            <s xml:id="echoid-s4632" xml:space="preserve">ideo ſi in priori loco cum navi ſubſtitiſſem, Solem veſperti-
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            nâ obſervatione reperiſſem ad altitudinem 10. </s>
            <s xml:id="echoid-s4633" xml:space="preserve">graduum quum
              <lb/>
            horologia indicabant non 2. </s>
            <s xml:id="echoid-s4634" xml:space="preserve">horas, ſed 2. </s>
            <s xml:id="echoid-s4635" xml:space="preserve">horas 4. </s>
            <s xml:id="echoid-s4636" xml:space="preserve">min. </s>
            <s xml:id="echoid-s4637" xml:space="preserve">ubi
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            tum loci ejus longitudinem, juxta regulam, inveniſſem 14 {1/2}. </s>
            <s xml:id="echoid-s4638" xml:space="preserve">
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            gradus Orientem verſus. </s>
            <s xml:id="echoid-s4639" xml:space="preserve">Sed certum eſt, me in priori temporis
              <lb/>
            dimidio inter 2. </s>
            <s xml:id="echoid-s4640" xml:space="preserve">obſervationes progreſſum fuiſſe {1/2} gradum,
              <lb/>
            quoniam ponitur, me toto tempore profeciſſe 1. </s>
            <s xml:id="echoid-s4641" xml:space="preserve">gradum,
              <lb/>
            velocitatemque fuiſſe æquabilem. </s>
            <s xml:id="echoid-s4642" xml:space="preserve">Eram igitur meridie in
              <lb/>
            longitudine 15. </s>
            <s xml:id="echoid-s4643" xml:space="preserve">graduum Orientem verſus, ſicuti prius erat
              <lb/>
            inventum.</s>
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            <s xml:id="echoid-s4645" xml:space="preserve">Pariter poteſt demonſtrari, progreſſum navis Occiden-
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            tem verſus nil obſtare, ſed regulam ſequendo, iterum in-
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            venire longitudinem loci, quem meridie præternavigaſti.</s>
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            <s xml:id="echoid-s4647" xml:space="preserve">Si jam curſus inter 2. </s>
            <s xml:id="echoid-s4648" xml:space="preserve">obſervationes Meridiem verſus
              <lb/>
            vel Septentrionem deſciſcat, imo licet fieret directe Septen-
              <lb/>
            trionem vel meridiem verſus, modo ponatur æquabilis velo-
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            citas, nullus inde orietur error ſi Solis altitudo ſumatur,
              <lb/>
            quando prope Orientem vel Occidentem eſt, quibus in lo-
              <lb/>
            cis alibi quoque dictum eſt optime fieri obſervationem.
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            </s>
            <s xml:id="echoid-s4649" xml:space="preserve">Ratio hæc eſt, quando 2. </s>
            <s xml:id="echoid-s4650" xml:space="preserve">loca Septentrionaliter vel Au-
              <lb/>
            ſtraliter a ſe mutuò diſtant, & </s>
            <s xml:id="echoid-s4651" xml:space="preserve">ſolummodo 1. </s>
            <s xml:id="echoid-s4652" xml:space="preserve">vel 2. </s>
            <s xml:id="echoid-s4653" xml:space="preserve">gra-
              <lb/>
            dus in latitudine differunt, ſi Sol reſpectu unius loci in O-
              <lb/>
            riente vel Occidente verſetur, ad certam ſupra horizon-
              <lb/>
            tem altitudinem, etiam quam proxime eodem tempore ad
              <lb/>
            eandem altitudinem ſupra horizontem alterius loci appare-
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            bit. </s>
            <s xml:id="echoid-s4654" xml:space="preserve">Ita ut comperiam, licet navis inter matutinam & </s>
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            veſpertinam obſervationem 2. </s>
            <s xml:id="echoid-s4656" xml:space="preserve">gradus navigaret, quod ra-
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            ro vel nunquam accidit, nullum tamen in longitudine er-
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            rorem hinc oriri poſſe, vel tantum paucorum minuto-
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            rum.</s>
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