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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">punctum H, emiſſæ lineæ rectæ dabunt lineas horarias à meridie, vel media nocte in plano,
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quod Verticali æquidiſtat, quarum ordinem paulo infra explicabimus in vtroque horologio. </
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hora verò ſexta ducenda eſt per H, linea C L, ad H E, perpendicularis, vel ipſi F K, æquidiſtans.
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">INTELLIGATVR portio Analemmatis horologio ſuperpoſita, ita vt punctum H,
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conſtructionis
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horologii Ver-
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ticalis.</
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puncto H, & </
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">punctum I, puncto I, atque recta H I, rectæ H I, congruat, (congruet autem ei, pro-
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pter æqualitatem rectarum H I, H I,) ipſaq́ue portio Analemmatis concipiatur animo recta ad
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planum horologij, & </
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">meridiana linea H E, habeat proprium ſitum, ita vt ſit communis ſectio
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Meridiani & </
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">H, in Auſtrali horologio verſus Zenith, & </
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dir; </
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ad planum horologij ſit perpendicularis, ita vt ſit communis ſectio Meridiani & </
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D, vertex ſtyli ſit centrum mundi, vt propoſ. </
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tionis Analemmatis intelligatur duntaxat triangulum D H I, ea ratione, vt diximus, ſuperpoſitũ
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eſſe horologio, ita vt D H, referat axem mundi, & </
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toris, & </
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<
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mundi ducti. </
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in I; </
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