Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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DE USU HOROLOG.
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<
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hora horologiorum longitudo mari inveniri
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queat.</
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<
s
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">Hæc ſane methodus meo judicio omnium eſt certiſſim@,
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cum ad eam neque notitia Poli elevationis, neque Solis de-
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clinationis, neque ulla inſtrumenta ad obſervandum requi-
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rantur; </
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<
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">cum neque refractio quid nocere poſſit, quoniam
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hæc in ortu & </
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<
s
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xml:space
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">occaſu Solis ejusdem diei parum aut nihil
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differre poteſt.</
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</
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<
s
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">Sicuti ergo antea docuimus horologia in naviadaptare, & </
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obſervare quâ horâ eorundem horologiorum Sol fuerit in
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meridiano; </
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<
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">hic eodem modo procedendum eſt, id eſt, in or-
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tu & </
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<
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">occaſu ſolis, ubi ejus medietas eſt ſupra horizontem,
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annotabis horam demonſtratam tunc temporis per horolo-
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gia; </
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<
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">& </
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<
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">licet interea velificando fueris progreſſus, nil re-
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fert, uti poſtea demonſtrabitur: </
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<
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xml:space
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">dein computans quot in-
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terea horæ horologiorum dilapſæ ſint, earumque dimidium
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addens ad horam ortus, habebis horam quam horologium
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indicabat quum Sol erat in Meridiano; </
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">ad quam addenda eſt
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æquatio iſtius diei ex tabula deſumta; </
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xml:space
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<
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">ſi ſumma æqualis
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ſit 12 horis, fuiſti meridie ſub eodem Meridiano, ſub quo
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horologia ad ſolem fuere adaptata; </
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</
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<
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">horas, fuiſti meridie ſub occidentaliori meridiano, quam
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loci ejus in quo horologia ſunt diſpoſita; </
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minor 12. </
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quindecim gradibus, quot horis ſumma fuerit minor vel exceſſe-
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rit 12. </
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">B, ut ante, fuiſſe ad-
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aptata ad Solem in loco ex quo deceſſiſti 2. </
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eſt ad horam Solis diminutam æquatione iſtius diei ſcil. </
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B. </
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ſcire deſiderans longitudinem loci in quem </
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