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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GNOMONICES
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prius, deſcripti erunt alii circuli poſitionum per partes domorum cœleſtium tranſeuntes. </
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<
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domibus cœleſtibus aliorum horologiorum obſeruandum erit.</
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<
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xml:space
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">QVOD ſi lineæ domorum cœleſtium in auſtrali horologio vltra horizontalem lineam excurrant,
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exhibebit nobis portio abſciſſa à linea horizontali, ſi inuertatnr, vt in ſcholio propoſ. </
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<
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cuimus, eaſdem lineas in horologio horeali, vt in eodem ſcholio demonſtratum eſt.</
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<
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<
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<
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deſcribere.</
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<
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xml:space
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<
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xml:space
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">Sole exiſtente Sole exiſtente in principio ♈,
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xml:space
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">Deſcriptio aſcẽ
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dentium ſigno-
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rum in eodem
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horologio Ver
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ticali.</
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& </
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<
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">♎, ſumantur horæ, quibus 12. </
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<
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xml:space
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">ſigna Zodiaci oriuntur, quæ in circulo ex E, deſcripto ſupputen-
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tur à linea meridiana vel verſus ortum, vel verſus occaſum, prout tabellæ indicant. </
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<
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/0248-01
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de ſupputationum, & </
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<
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xml:space
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">centrum E, rectæ occultæ educantur ſecantes lineam æquinoctialem in pun-
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ctis, per quæ lineæ aſcen dentium ſignorum, hoc eſt, communes ſectiones plani horologii, & </
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<
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diaci in ortu ſignorum duci debent. </
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<
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xml:space
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">Verbi gratia, quoniam Sole exiſtente in æquinoctiali circulo,
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nempe in principio ♈, principium ♉, oritur hora 4. </
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>
<
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">Min. </
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<
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<
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xml:space
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">ante meridiem, ſupputandę erunt
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in horologio auſtrali horæ 4. </
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<
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<
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<
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xml:space
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">à puncto N, dextram verſus vſq; </
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<
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">ad punctum A; </
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<
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">atque per
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A, & </
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<
s
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xml:space
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">centrum E, recta occulta protrahenda ſecans æquinoctialem lineam in B, puncto, per quod
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traiicienda eſt linea aſcendentis ſigni ♉. </
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<
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xml:space
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">Nam Sole exiſtente in principio ♈, & </
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<
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">oriente ♉, hoc eſt,
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hora 4. </
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<
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<
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xml:space
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">51 ante meridiem, vmbra gnomonis proiicitur in punctum B, vt conſtat ex iis, quæ
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propoſ. </
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<
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<
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">huius libri demonſtrata ſunt. </
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<
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xml:space
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">Non ſecus inquirenda erunt puncta aliorum ſignorum
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aſcendentium in linea æquinoctiali.</
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<
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<
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xml:space
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">POST hęc in linea horizontali notentur ex propoſ. </
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<
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">14. </
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<
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">huius libri puncta, in quibus ab ar-
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cubus ſignorum ſecatur. </
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<
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xml:space
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">In hæc enim proiicientur vmbræ ſtyli, illis ſignis orientibus, occidenti-
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busve cuiuſmodi ſunt puncta C, D, F, K, L, M. </
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<
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xml:space
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">Nam in C, in horologio auſtrali occidunt ♏, & </
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♓; </
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<
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<
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<
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xml:space
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">At in punctis K, L, M, eadem ſigna oriuntur. </
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<
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xml:space
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">In horologio autem bo
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reali in C, occidunt ♉, & </
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<
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<
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">in D, ♊, & </
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<
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<
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<
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">& </
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<
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xml:space
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">in punctis K, L, M, eadem ſigna oriun-
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tur, vt perſpicuum eſt, ſi horologium boreale in proprio ſitu collocetur in facie Septentrionali,
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ita vt centrum horologii H, ſit infra lineam horizontalem, & </
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<
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& </
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<
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<
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xml:space
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">Sumimus enim nunc pro horologio boreali totum auſtrale, ſi ſuperior
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pars mutetur in inferiorem, ita vt centrum H, infra lineam horizontalem poſitum ſit.</
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</
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<
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<
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">HÆC autem puncta inueniemus etiam hac ratione in linea horizontali vtriuſque horolo-
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gii, etiamſi arcus ſignorum in eo non ſint deſcripti. </
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<
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<
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<
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