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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poſitionem vtriuſque horologii diligenter conſideranti. </
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xml:space
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">Erunt autem ſectiones R S, T V, inter ſe paral-
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lelæ, cum factæ ſint in planis horologiorum parallelis ab eodem circuli maximi plano. </
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rectæ A E, C N, parallelæ ſunt, vt dudum oſtendimus; </
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<
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xml:space
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">erunt anguli E A S, N C V, inter ſe æquales,
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15. primi.</
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Cum ergo anguli ad verticem E A S, L A R, ſint etiam ęquales, erunt quoque anguli L A R, N C V,
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ęquales. </
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<
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xml:space
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">Superpoſita ergo rurſus recta A G, rectæ C H, vt punctum A, in punctum C, cadat, & </
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<
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ſitu auſtrale ſiue ſuperius horologium conuerti intelligatur circa rectam A G, vel C H, (quę eadem in
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eo ſitu eſt) vt pars ſuperior in inferiorem mutetur, & </
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<
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xml:space
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">contra, cadet recta A R, in rectam C V, pro-
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pter ęqualitatem angulorum L A R, N C V. </
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<
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xml:space
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">Eadem{q́ue} ratio eſt de quibuſcunque aliis lineis per A,
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& </
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<
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<
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">Quare, vt prius, portio à linea horizontali abſciſſa, ſi inuertatur, vt ante
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dictum eſt, dabit horologium in facie plani horologii oppoſita delineandum.</
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">LIBVIT hæc vberius hoc loco demonſtrare, ne eandem demonſtrationem in ſequentibus cogere-
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mur ſæpius inculcare. </
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<
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xml:space
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">Magnam enim vtilitatem ſequentibus afferent, vt ſuis locis manifeſtum erit.</
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<
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xml:space
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ticali deſcribere.</
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<
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">SI loco radiorum Zodiaci ex puncto D, figuræ radiorum Zodiaci antecedentis propoſ. </
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cuum diurnorũ
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in prædicto ho-
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rologio Verti-
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cali.</
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cantur radii longitudinum dierum inuenti propoſ. </
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">vel in Analemmate eiuſdem
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præcedentis propoſ. </
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<
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">loco parallelorum per initia ſignorum tranſeuntium aſſumantur paralleli ar-
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cuum diurnorum; </
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<
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ſcripſimus. </
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">in illis ratio, cum omnes Aequatori ſint æquidiſtantes. </
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rallelos igitur arcuum diurnorum, &</
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<
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ſcribere.</
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<
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">IN lineam meridianam horologii ex G, loco ſtyli transferatur magnitudo ſtyli vſque ad A,
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culorum Verti-
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calium in eode
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Verticali horo-
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logio.</
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punctum, quod vel infra G, vel ſupra ſumi poteſt. </
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<
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">Ex A, autem circulus cuiuſque magnitudinis
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deſcribatur, quo diuiſo in 360. </
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<
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">partes æquales, initio facto à linea meridiana, ſi omnes Verticales
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deſiderentur, vel in pauciores, pro numero Verticalium deſcribendorum, (Nos eum diuiſimus in
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24. </
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<
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<
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<
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occultæ ſecantes lineam horizontalem in punctis, per quæ ſi ducantur rectę æquidiſtantes </
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