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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">DE HOROLOGIIS, QVAE A VER-
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ticali circulo declinant.
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PROBLEMA 1. PROPOSITIO 1.</
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">HOROLOGIVM Aſtronomicum à Verticali circulo decli-
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nans, hoc eſt, Lineas horarum à meridie, vel media nocte in plano,
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quod circulo cuipiam maximo ęquidiſtat, qui à Verticali circulo pro-
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prie dicto declinat, & </
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<
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">ad Horizontem rectus eſt, deſcribere.</
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</
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<
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<
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">IN plano aliquo ducantur duæ rectæ A B, C D, ſeſe ad angulos rectos ſecantes in
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">Conſtructio ho
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rologii Aſtrono
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mici à Vertica-
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li declinantis.</
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E. </
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<
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">Deinde ad rectam C D, in puncto E, conſtituatur angulus declinationis plani,
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in quo horologium ponendum eſt, quæ qua ratione inquiratur, demonſtrauimus
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propoſ. </
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">Hoc autem ordine conſtituendus erit hic angulus. </
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<
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">Si pla-
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num declinat à meridie, conſtituendus erit angulus declinationis infra rectam
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A B, verſus quidem punctum A, ſi in ortum vergit, ſi verò in occaſum, verſus B.
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</
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<
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">Si autem planum à ſeptentrione declinat, erit angulus conſtituendus ſupra rectam A B, verſus
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">Horologiam,
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quod deſcribi-
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t
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ur, declinat à
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meridie in or-
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c
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um grad. 30.</
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quidem B, ſi in ortum vergit, ſi verò in occaſum, verſus A. </
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xlink:href
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/0310-01
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declinare à meridie in ortum grad. </
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<
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<
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">idcirco angulus declinationis D E F, conſtitutus eſt infra
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rectam A B, verſus A; </
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<
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">qui quidem angulus facile conſtituetur, ſi ex E, arcus circuli deſcribatur,
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in eoq́ue declinatio ſupputetur à recta C D. </
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<
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">Nam E F, recta ex E, per finem ſupputationis educta
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tionis quæ ſit
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in horologio de
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cli nante.</
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conſtituet angulum declinationis in puncto E. </
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<
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<
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