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 TERTIVS.
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los β E C, F E C, & </
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Meridiani per rectas F E, E C, ducti cum F E, meridiana linea Verticalis in F, centro mundi angulum
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conſtituit E β C, complemento altitudinis poli ſupra Horizontem æqualem. </
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<
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<
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">punctum C, in plano horologii, in quod axis cadit, centrum erit horologii. </
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<
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">Hinc fit, rectam C K, eſ-
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ſe lineam ſtyli, quemadmodum & </
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<
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">linea styli C G, ducta eſt ex cen-
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tro C, per k, locum ſtyli. </
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<
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">Pari ratione efficitur, rectam α G, quæ ad lineam ſtyli perpendicularis eſt, eſ-
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ſe lineam æquinoctialem, quandoquidem per punctum α, ducenda eſt, vt nuper oſtendimus, & </
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<
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rectos facit cum linea ſtyli, vt in priori deſcriptione horologij declinantis à Verticali propoſ. </
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demonſtratum eſt à nobis. </
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<
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eius{q́ue} ſcholio, vbi horologium declinans à Verticali ad datum ſtylum, eius locum conſtruximus.</
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</
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<
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dem horologii
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ex @llipſi.</
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lib. </
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">cõmodiſſime quidem, quoad illas boras, quę
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vix ęquinoctialem lineã interſecant, quales in noſtro exẽplo ſunt horę 8. </
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plum huius deſcriptionis non confecimus, quia ſine vllo labore res ipſa per cipi poteſt ex figura, quam in
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dicto ſcholio propoſ. </
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<
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<
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grad. </
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<
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">ex parte orientali, ita vt occaſum reſpiciat, fabricatum ad latitudinem gr. </
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plementũ est illius latitudinis, ad quã illud horologiũ à Verticali declinans cõſtructũ eſt; </
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numeris horarum in earundem complementa vſque ad 12. </
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propoſ. </
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<
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quod ab Horizonte declinat, figurare.</
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<
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">PRORSVS ijſdem modis in hoc horologio arcus ſignorum deſcribentur, quibus deſcri-
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cuum ſignorũ
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in hologio de
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-
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clinante ab Ho
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siaont
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e.</
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pti ſunt in horologio declinante à Verticali, vt in ſubiecta figura apparet. </
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utem in f
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i-
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gura radiorum ex C, lineas illis duntaxat horis reſpondentes, quæ in horologio ad ſiniſtram </
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