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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pter æqualitatem
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rectatum B D, B A,) atque adeo ipſe in plano Verticalis circuli propriè dicti col
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locetur, (Nam, vt propoſ. </
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<
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<
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">demonſtrauimus, Verticalis propriè dictus ducitur per re-
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ctas A B, B F, per quas etiam ducitur planum circuli ex D, deſcripti, ſi poſitionem habeat, quam
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illa conuerſione acquiſiuit) erunt rectæ illæ per centrum D, & </
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<
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nes ſectiones circuli Verticalis propriè dicti, & </
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<
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<
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tunc recta, D B, eadem prorſus eſt, quæ A B, communis ſectio Verticalis dicti, & </
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quidem vnus eſt ex circulis domorum cœleſtium. </
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<
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">Igitur dicti circuli planum horologij ſecabunt
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in punctis rectæ B F, in quæ dictæ ſectiones communes cadunt; </
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tranſibunt communes ſectiones eorundem circulorum, & </
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etiam ducantur per punctum E, vt paulo ante oſten dimus, dabunt rectæ per E, & </
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B F, emiſſæ domos cœleſtes ſecundum Campanum. </
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tiſſimis illis lineis ſunt diſtinctæ: </
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ptionis. </
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deſcribere.</
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figaorũ in e
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o-
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dem horologio
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declinante à
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Verticali de-
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ſcri ptie.</
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men quatuor tabulis propoſ. </
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pterea quòd horæ à meridie, vel ante meridiem initium habentes à recta L M, diametro circuli
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ex L, deſcripti, vix omnes cadunt in lineam æquinoctialem. </
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">Vt in noſtro exemplo, ſigna illa, quæ
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poſt horam 2. </
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la linea horaria poſt horam 2. </
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