Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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CHRIST. HUGENII INSTITUTIO
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tum eſt: </
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<
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">gradus Orientem verſus ab alio
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diſtat, tantum etiam Occidentem verſus inde diſtare: </
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">& </
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riter, qui 300. </
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<
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">gradus Orientaliter ab alio diſtat etiam 60.
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</
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<
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<
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<
s
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xml:space
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">Quandoquidem pro invenienda longitudine requiritur ut
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hora loci, in quo es, cognita ſit, ut ſupra dictum eſt, di-
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cta hora ſumma exactitudine eſt obſervanda; </
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<
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enim minutum quo in calculo aberras conſtituit errorem {1/4}.
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</
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<
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xml:space
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">gradus in longitudine, id eſt, prope Æquatorem 3{1/4}. </
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<
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xml:space
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">Germa-
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nicorum milliarium ſed minus ubi longe inde abes:</
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<
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">Quare ad certam horæ inventionem, ne fidas obſervationi
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maximæ Solis altitudinis, ut inde concludas præciſe meridiem
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eſſe vel Solem in Meridiano, niſi inter Tropicos Sol fuerit in
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ipſo puncto Zenith vel ei quam proximus. </
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<
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xml:space
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">Nam alias Sol
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exiſtens prope Meridianum aliquamdiu perſeverat ſine ulla
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ſenſibili mutatione altitudinis ſuæ; </
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<
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xml:space
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">ideoque altitudo meri-
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dialis idonea ſatis eſt ad latitudinem vel elevationem Poli
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loci alicujus dimetiendam, non tamen ad longitudinem ejus
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exacte inveniendam. </
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<
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">Multo minus niti potes pyxidibus nau-
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ticis in accurato meridiei tempore inquirendo.</
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<
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">Neque annuli Aſtronomici vel alia horologia ſolaria certa
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ſatis ſunt in oſtendenda hora ad minuta & </
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<
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lius eſt obſervare ſolis altitudinem, ubi eſt in Oriente vel
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Occidente, quo autem Orienti aut Occidenti propior eſt,
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eo melius; </
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<
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">ibi enim cum eſt, mutatur ejus altitudo ſen-
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ſibiliter magis quam ante vel poſt & </
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<
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">ita, ex inventa Poli ele-
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vatione, & </
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<
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">nota Solis declinatione, hora poteſt computatione
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detegi, cujus modus ab aliis ſatis deſcriptus eſt; </
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<
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computatio illa moleſta eſt & </
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<
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">nonnulli errores in menſuranda
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altitudine Solis committi poſſunt faciliorem hic methodum
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oſtendam & </
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