Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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CHRIST. HUGENII INSTITUTIO
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<
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xml:space
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">Quando videndam ſe offert regio cognita, ne negli-
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gas annotare longitudinem illius, quantum exacte fieri
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poterit, ex inventa longitudine loci in quo verſaris; </
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<
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">Pri-
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mo ad corrigendas inde mappas marinas, poſtquam longitu-
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do loci fuerit diverſis temporibus comperta eadem, ita ut
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nil amplius de ea dubites. </
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<
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xml:space
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">In his enim mappis quantum atti-
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net ad ſitum locorum Orientem & </
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<
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xml:space
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">Occidentem verſus, multa ſu-
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perſunt emendanda. </
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<
s
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xml:space
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">Secundo ut ſcias, in proſecutione tui
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itineris, quantum reſpectu loci viſi velificando progreſſus
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fueris ad Orientem vel Occidentem: </
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<
s
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xml:space
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">etiamſi infortun@o,
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vel negligentia, omnia quieſcant Horologia, poteris eadem
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ad motum rurſus adaptare, & </
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>
<
s
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">diſponere ad horam per So-
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lem compertam. </
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<
s
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xml:space
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">computando porro longitudinem ab ejus-
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dem loci viſi Meridiano. </
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<
s
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xml:space
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">Nam nullatenus teneris certum
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Meridianum alicujus loci cogniti, pro initio computationis
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longitudinum habere, cujus uſus tantum eſt in mappis vel
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Tabulis longitudinum, in quo caſu uſu venit Meridianus
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montis Pici in inſula Teneriffa, vel Meridianus inſularum
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Corvo & </
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<
s
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xml:space
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">Flores, occidentaliſſimarum Azorum vel inſula-
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rum Flandricarum, vel cujusvis alterius loci: </
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<
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xml:space
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">& </
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<
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">foret egre-
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gium (quod non obtinet) ſi omnes auctores unum eundem-
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que Meridianum pro primo eligerent, ut ſingula loca iis-
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dem gradibus longitudinis pariter ac latitudinis determina-
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rentur: </
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<
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xml:space
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">ſed in itinere ſatis eſt longitudinum differentiam ob-
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ſervare, initio computationis facto a Meridiano cujuscunque
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loci.</
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<
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<
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">Si accidat, ut mari medio omnia Horologia quieſcant,
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quam primum fieri poteſt, rurſus eadem ad motum </
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