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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duatum figu-
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rarum ex An-
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drea Schonero@
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per quas ſigna
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aſcendentia de
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-
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ſcribuntur.
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Andrea Schonero deſcribemus hac ratione.
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<
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trum E, & </
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los ſe ſecantes A C, B D. </
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<
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inde arcus A F, C G, maximæ declina-
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tioni Solis æquales, & </
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rectæ emiſſæ ſecent rectam AC, productam
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in H, I. </
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<
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declinationi maximæ Solis duplicatæ æqua-
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les, & </
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">per K, L, rectæ ex B, eductæ ſecent
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eandem A C, productam in M, N. </
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ex M, centro, interuallo M H, vel M I,
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(Nam recta H I, in M, bifariam diuidi-
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tur) circulus deſcribatur H B I D, qui per
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B, D, tranſibit. </
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<
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C D, in partes 12. </
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<
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libet bina puncta à D, vel B, æqualiter re-
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mota lineis rectis ſecantibus rectam B D,
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in punctis, per quæ ſi ex N, rectæ ducantur
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ſecantes circulum H B I D, in punctis, & </
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per hæc rurſus rectæ ex E, emittantur, erũt
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hæ lineæ ſignorum, ita E D, ſit ♈; </
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♋; </
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igitur figuram inueniemus intropicis ♋, & </
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♑, puncta, per quæ lineæ ſignorum aſcen
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dentium duci debent, vt docebimus.</
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A B C D, cuius centrum E, & </
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tri ſeſe ad angulos rectos ſecãtes A C, B D,
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