Clavius, Christoph
,
Gnomonices libri octo, in quibus non solum horologiorum solariu[m], sed aliarum quo[quam] rerum, quae ex gnomonis umbra cognosci possunt, descriptiones geometricè demonstrantur
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LIBER SECVNDVS.
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<
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<
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xml:space
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">Hoc eſt, lineas horarum ab ortu Solis in plano Horizonti æquidiſtan-
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te deſcribere.</
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<
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<
s
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xml:space
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">EADEM arte, qua in deſcribendis lineis horarum ab occaſu vſi ſumus, deſcribemus lineas
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horarum ab ortu. </
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<
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xml:space
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">Hæ enim ab illis non differunt, niſi ſitu, & </
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<
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<
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<
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translata ad horas ante meridiem ſit hora prima ab ortu, & </
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<
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<
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">eodem modo translata ſit ho
<
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ra ſecunda, &</
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<
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<
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">vt perſpicuum eſt, ſi rectè contemplemur naturam, & </
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<
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">ſitum iſtorum circulorum
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horariorum, & </
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<
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">figuram antecedentis propoſ. </
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<
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">Quemadmodum ergo pro horologio Italico deſcri
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xml:space
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">Deſcriptio@ ho-
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rologii Babylo
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nici horizo@ta-
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lis.</
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bendo ſecundum priorem modum diuiſie
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nem circuli M a N b, incepimus à punctis b, & </
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<
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">e, occi-
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<
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152
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xlink:href
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/0219-01
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<
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xlink:label
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dentalibus, ita eandem pro horologio Babylonico inchoabimus à punctis a, & </
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<
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">d, orientalibus;
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</
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<
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">ita vt puncta a, d, pertineant ad horam 24. </
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<
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xml:space
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">ab ortu in vtroque tropico, proxima verò verſus N, ad
<
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<
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">40</
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horam primam, & </
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<
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">ſequentia ad ſecundam, &</
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<
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">c. </
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>
<
s
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xml:space
="
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">Per hæc enim diuiſionum puncta reperiemus in
<
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vtroque tropico puncta horarum ab ortu Solis, vt ſupra de punctis horarum ab occaſu diximus.</
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>
<
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</
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<
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>
<
s
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xml:space
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">POTEST etiam diuiſio circuli M a N b, initium habere à puncto cuiuſuis horæ ab ortu in
<
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cius circunferentia inuentę, vt in pręcedenti propoſ. </
s
>
<
s
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">declaratum eſt.</
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<
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</
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<
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<
s
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xml:space
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">IN alijs modis nulla etiam difficultas eſt, ſi pręcepta pręcedentis propoſ. </
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<
s
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">rectè intelligantur, & </
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<
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<
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tabulæ propoſ. </
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<
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xml:space
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">& </
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<
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">33. </
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<
s
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xml:space
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">ſuperioris libri diligenter expendantur, vt puncta inueniantur, in
<
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quibus ſe mutuo interſecant lineæ horarum à meridie vel media nocte, & </
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>
<
s
xml:id
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">ab ortu vel occaſu.</
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<
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<
s
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">SIT enim exempli gratia deſcribendum horologium Babylonicum iuxta ſecundum modum
<
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<
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">Alia deſcriptio
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horologii Baby
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lonici horizon-
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talis, ex arcu-
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bus diurnis.</
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per arcus diurnos. </
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<
s
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xml:space
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">Hora prima ab ortu tranſit, vt ex tabulis propoſ. </
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<
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<
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">præcedentis lib. </
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<
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">pater, per
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horam ſextam à media nocte in arcu diurno horaru m 14. </
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<
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xml:space
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">& </
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<
s
xml:id
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xml:space
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">per horam ſeptimam à media nocte
<
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<
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xlink:label
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in arcu diurno horarum 12. </
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<
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<
s
xml:id
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xml:space
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">per horam octauam à media nocte in arcu diurno horarum 10.
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</
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<
s
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">Igitur recta linea per haſce horas à med. </
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<
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">noc. </
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<
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<
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<
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xml:space
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<
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">ita de reliquis. </
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Horæ autem, quæ in arcu diurno horarum 10. </
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<
s
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">nulla habent puncta, vt ſunt omnes horæ poſt ho@ã
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nonam ab ortu in noſtro exemplo, ducendæ erunt per puncta in arcubus diurnis horatum 14. </
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<
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12. </
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<
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">At hora duodecima ab ortu ducenda eſt parallela lineę ęquinoctiali (quia linea horę duodeci
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mę ab ortu, vel occaſu, & </
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>
<
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">linea ęquinoctialis, parallelę ſunt in horologio horizontali, vt ex ſcholio
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propoſ. </
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<
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<
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<
s
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">manifeſtum eſt) per horam quintam à meridie in arcu diurno hora-
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rum 14. </
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<
s
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">Pro hora deinde 13. </
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<
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">ab ortu, quoniam ſolum punctum habet horæ ſextę à meridie in a@-
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cu diurno horarum 14. </
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<
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<
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">ab occaſu per horam octauam à media nocte in arcu diur-
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no horarum 14. </
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<
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xml:space
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">& </
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<
s
xml:id
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">per horam ſeptimam à media nocte in arcu diurno horarum 12. </
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>
<
s
xml:id
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xml:space
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">Hæc enim vl-
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tra arcum maximi parallelorum ſemper apparentium producta dabit, vt in ſcholio </
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