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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trum H, ducta, & </
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<
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terioris circuli ducatur diametro S T, quæ meridianam lineam ad rectos angulos ſecat, parallela occulta
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F L; </
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<
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">quod facile fiet, ſi recta occulta ducatur ex F, ad punctum M, quod tanto interuallo abſit à punct@
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S, quanto punctum F, à puncto T, abeſt. </
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<
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xml:space
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<
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<
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<
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<
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lineę H B, parallela occulta K L; </
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<
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">quod facile etiã fiet, ſi recta occulta ducatur ex K, ad punctum N, quod
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tanto ſpatio diſtet à puncto R, quanto abeſt ab eodem punctum K: </
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in L. </
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<
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">Quod ſi idem fiat cum reliquis binis punctis diuiſionum reſpondentibus, vt in figura apparet, inuenta
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erunt puncta ellipſis, cuius maior diameter eſt B V, & </
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</
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<
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<
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<
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xml:space
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rarias, ita vt quælibet eam horam referat, quam puncta diuiſionum reſpondentia in circulis referunt. </
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<
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quoniam punctum F, refert quartam horam poſt meridiem, idcirco recta H L, ducta dabit horam quar-
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tam à meridie, & </
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<
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<
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xml:space
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">Atque hac ratione commodiſſime horas ducemus, quia ſemper terna pun
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cta pro ſingulis horis habemus, quorum duo ſunt oppoſita in ellipſi, qualia ſunt L, & </
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<
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eſt ipſum centrum H. </
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<
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xml:space
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X γ, oppoſiti arcubus T F, R K, æquales, ducantur{q́ue} rectæ β α, γ α, diametris S T, B V, parallelæ ſe-
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cantes ſeſe in α. </
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<
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xml:space
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">Iam vero ſi dimidiatas horas, & </
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tes earundem deſcribere lubeat, diuidendæ erunt ſingulæ partes circulorum bifariam, & </
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<
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tes, & </
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<
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huius deſcri-
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ptionis.</
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num horologij, & </
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interuallum A B, concipiatur deſcriptus circulus θ Y B Z, Aequatori concentricus, & </
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<
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toris, qui propterea, vt Aequator, in 24. </
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& </
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<
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dum & </
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<
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P, in Aequatore pertineat ad horam 4. </
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<
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<
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tur, ita vt ſemicirculus θ Y B, ſit occidentalis, & </
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<
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