Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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CHRIST. HUGENII INSTITUTIO
"/>
demonſtrationem etiam revera exactis Pendulis compertum
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eſt, quod ad inæqualitatem dierum ad rectam menſuram re-
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ducendam, æquatio, prout eam hic per præcedentem Ta-
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bulam inſtituimus, exacte cum experientia conveniat, ita ut
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tuto ei confidere liceat. </
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>
<
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xml:space
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preserve
">Idque tanti momenti eſt in inve-
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niendis longitudinibus, ut, ſi non fuerit obſervatum, non-
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nunquam ſpatio 3 menſium in calculo errorem committas 7
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graduum & </
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>
<
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xml:space
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">amplius, ſine ulla tamen horologiorum culpa:
<
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</
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<
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xml:space
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">qui gradus ſub Tropicis ultra 100 Germanica milliaria conti-
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nent.</
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<
s
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xml:space
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">Oſtenſo, quomodo horologia poſſint adaptari terrâ, vel
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quomodo eorum differentia quotidiana ſit invenienda, pro-
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ximum erit dicere, quomodo idem faciendum ſit in navi fixa
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ad anchoram, cum minime poſſibile ſit idem præſtare in ve-
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lificatione.</
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<
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xml:space
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">Obſervabimus quodam die ortum & </
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">occaſum Solis, & </
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utraque obſervatione ubi ejus medietas exacte ſupra Horizon-
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tem apparet, notabimus horam quam indicat horologium,
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& </
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>
<
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xml:space
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">ſupputabimus quot horæ interea fuerint præteritæ, cujus
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numeri dimidio addito ad horam obſervationis matutinæ,
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habebimus horam quam indicavit horologium cum Sol eſ-
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ſet in meridiano: </
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>
<
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xml:space
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">cui addens Tabulæ æquationem iſtius diei,
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ſummam notabimus, & </
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">horologium ulterius promoveri pa-
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tiemur. </
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<
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xml:space
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">dein quibusdam diebus, elapſis (quo autem plures
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præterierint, eo melius eſt) idem omnino faciemus; </
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<
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xml:space
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">Et ſi
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hora hujus ultimi diei ſit eadem, cum ea quæ antea fuerat
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notata, horologium recte accommodatum eſt. </
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<
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xml:space
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">Sin vero ma-
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jor vel minor ſit, vel lentius vel celerius movetur, & </
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xml:space
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">diffe-
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rentia diviſa per numerum dierum interim dilapſarum dabit
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quotidianam differentiam, quam annotabimus, & </
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horologium relinquemus in illo ſtatu; </
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<
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">vel alioquin remo-
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vendo minus pondus penduli ut ſupra dictum eſt, melius
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horologium accommodabimus.</
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<
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">pone 21. </
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xml:space
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">Martii mane cum ſolis medie-
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h. # m. # ſ.
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5. # 30. # 10.
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5. # 20. # 6.
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tas apparet ſupra horizontem horologium indicare.
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</
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<
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xml:space
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">Et veſperi ubiSolis medietas latet infra horizontem.</
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