Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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CHRISTIANI HUGENII
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absque errore, oculus ad idem punctum reponi poſſit. </
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<
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<
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<
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.</
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ad momentum ipſum, cum ſtellarum aliqua è conſpectu abit,
<
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notetur tempus horologio indicatum. </
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<
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xml:space
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die, vel potius aliquot diebus intermiſſis, fiat. </
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<
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xml:space
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">Quod ſi
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tantum unius diei ſpatium duabus obſervationibus interceſſe-
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rit, oportet in poſtrema obſervatione tempus horologii de-
<
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ficere ab illo, quod prima obſervatione annotatum fuerat,
<
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ſcrupulis primis 3, ſecundis 56. </
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xml:space
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">Ita enim rectè ſe habere
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perpendiculi longitudinem conſtabit; </
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<
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xml:space
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">quum tanto ſuperetur
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quælibet ſiderum fixorum revolutio à die ſolari mediocri.
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</
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<
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xml:space
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">Mediocri dico, quoniam dies ſolares, de meridie ad meri-
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diem, non omnes inter ſe æquales ſunt, ut mox amplius
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exponetur. </
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<
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xml:space
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">Si vero poſt plures demum dies obſervatio re-
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petatur, in ſingulos tantundem differentiæ cauſa computan-
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dum erit. </
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<
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xml:space
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">Sit, exempli gratiâ, in prima obſervatione, ad
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momentum evaneſcentis ſtellæ, adnotata horologii hora 9,
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cum ſcrupulis primis 30, ſecundis 18; </
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<
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xml:space
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">deinde, ſeptimo
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poſt die, eâdem diſparente ſtellâ, indicet horam 8, cum
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ſcrupulis pr. </
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xml:space
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lis pr. </
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<
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xml:space
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">39, ſecundis 54. </
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<
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xml:space
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">Quæ, in ſeptem diviſa, dant retar-
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dationem diurnam ſcrupulorum 5′. </
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<
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">42″. </
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<
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xml:space
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">Debebat autem eſſe
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ſcrupulorum 3′.</
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<
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xml:space
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">56″. </
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<
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xml:space
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">quæ illâ minor eſt ſcrupulis 1′.</
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xml:space
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">46″. </
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<
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xml:space
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">Ita-
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que tantundem quotidie deficit horologium à vera, ſeu me-
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dia, dierum menſura.</
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<
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xml:space
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">Cæterum alio quoque modo, ad ſolem, horologii motum
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examinare licebit. </
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>
<
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xml:space
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">Sed hic jam inæqualitatis dierum natu-
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ralium ratio habenda erit. </
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>
<
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xml:space
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preserve
">Sunt enim, ut jam dixi, non
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omnes ejusmodi dies inter ſe æquales; </
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">& </
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<
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xml:space
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">quanquam exi-
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guum ſit diſcrimen, tamen plurium dierum intervallo ſæpe
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eo usque excreſcit, ut haudquaquam contemni poſſit. </
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nim ſi & </
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<
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">ſolarium quam perfectiſſime deſcriptum habeatur,
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& </
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<
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xml:space
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">horologii automati motus ad veriſſimam dierum menſu-
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ram exactus ſit, neque ab ea recedat; </
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<
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xml:space
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">eveniet tamen neceſ-
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ſario ut, certis anni temporibus, ſæpe horæ quadrante, aut
<
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/>
etiam ſemihora, inter ſe diſcrepent, ac rurſus ſtatis tempo-
<
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ribus ultro concordent. </
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<
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xml:space
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">Hoc enim ita eſſe, ex tabula </
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