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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circino ſemidiametrum quamcunque, vt A E, vel A K, in quadrante, & </
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rentiam occultam deſcribemus H I, vel M N, in qua ſi ſumatur arcus H I, vel M N, æqualis @arcui qua-
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drantis E F, vel K L, qui complectatur grad@ 42. </
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<
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xml:space
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tis E F, vel K L, qui grad. </
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<
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<
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xml:space
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">ducantur{q́ue} rectæ G N I, G Q P, erunt I G H, P G H,
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anguli quæſiti, & </
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<
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xml:space
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">VIDES igitur, quanto labore nos leuet quadrans eo modo, quo diximus, conſtructus. </
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<
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careamus, cogemur ſemper cir culum propoſitum diuidere in ſuos gradus, quod quàm laborioſum ſit, atq;
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</
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<
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<
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xml:space
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">Itaque vt paucis vniuer ſum vſum quadrantis huius complectamur, quotieſcun-
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qu@ in hac Gnomonica numeranda eſt altitudo poli, vel declinatio alicuius plani à verticali, inclinatioue
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ad Horizontem certo numero graduum comprebenſa, vel certè conſtituendus ad aliquam rectam in dato
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puncto angulus graduum 20. </
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<
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<
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">vel quotcunque, recurrendum erit ad quadr antem hoc loco conſtru-
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ctum, atque ex eo gradus propcſiti in datam figuram transferendi, vt in ſuperioribus exemplis factũ eſt,
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ne cogamur cir culos in ſuos gradus partiri: </
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<
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xml:space
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">quæ res plena eſſet laboris, atque moleſtiæ.</
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<
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xml:space
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<
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drantis extra lineas A B, A C, & </
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<
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">circunferentiam B C, reſecentur, relicta tamen portiuncula quadam
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circa centrum A, quæ clauiculum includat, vt figura indicat; </
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<
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diorem vſum, & </
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xml:space
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figuræ, recta{q́ue}, A B, rectę G H, congruat, ſignabimus ſtatim ſtylo quopiam acuto prope grad. </
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ctum S, & </
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xml:space
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H I, grad. </
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15. </
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<
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iamiam ſequitur, agemus, vt eos, quando opus erit, transferre poſſimus in aliam figuram, quæ pro deſcri-
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bendis arcubus ſignorum in horologijs conſtruenda eſt, vt ex ſequentibus patebit.</
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<
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">LIBVIT hoc loco quadrantem hunc explicare, non quòd eius vſus ſit omnino neceſſarius, ſed
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quòd per eum facilius & </
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">expeditius horologia deſcribamus, cum in noſtra hac Gnomo-
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nica frequentiſſimè numeranda ſit altitudo poli, vel Aequatoris, decli-
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natio plani, inclinatio{q́ue}, & </
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<
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cunque graduum, & </
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<
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tius per Quadrantem eo modo diui-
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ſum abſoluuntur, vt ex pro-
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poſitis exemplis ma-
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nifeſtum eſt.</
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