Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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CHRISTIANI HUGENII
"/>
absque errore, oculus ad idem punctum reponi poſſit. </
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>
<
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xml:space
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<
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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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">Atque idem poſtero
<
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die, vel potius aliquot diebus intermiſſis, fiat. </
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>
<
s
xml:id
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xml:space
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preserve
">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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<
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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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>
<
s
xml:id
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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.
<
lb
/>
</
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>
<
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xml:space
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">Mediocri dico, quoniam dies ſolares, de meridie ad meri-
<
lb
/>
diem, non omnes inter ſe æquales ſunt, ut mox amplius
<
lb
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exponetur. </
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>
<
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xml:id
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xml:space
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preserve
">Si vero poſt plures demum dies obſervatio re-
<
lb
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petatur, in ſingulos tantundem differentiæ cauſa computan-
<
lb
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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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>
<
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xml:space
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xml:space
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">24. </
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>
<
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xml:space
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">Hæc hora deficit à priore ſcrupu-
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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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xml:space
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">42″. </
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>
<
s
xml:id
="
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xml:space
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">Debebat autem eſſe
<
lb
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ſcrupulorum 3′.</
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>
<
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xml:id
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xml:space
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">56″. </
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>
<
s
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xml:space
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">quæ illâ minor eſt ſcrupulis 1′.</
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>
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xml:space
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">46″. </
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>
<
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xml:id
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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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</
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<
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xml:space
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">Cæterum alio quoque modo, ad ſolem, horologii motum
<
lb
/>
examinare licebit. </
s
>
<
s
xml:id
="
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"
xml:space
="
preserve
">Sed hic jam inæqualitatis dierum natu-
<
lb
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ralium ratio habenda erit. </
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>
<
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xml:space
="
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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xml:space
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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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>
<
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xml:space
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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:id
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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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