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 PRIMVS.
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deſcendat deorſum. </
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<
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xml:space
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">Hoc enim inſtrumento facile Ellipſim deſcribemus, ſi eius cruribus dilatatis, frusta
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illa ſtatuantur in punctis inuentis F, & </
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<
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">G, ita vt recta ſint ad planũ, filum{q́ue} cir cũponamus, vt ſupra dixi-
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mus. </
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<
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">Sed quoniã filũ intenditur ſemper & </
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<
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">remittitur aliquantulũ, multo accuratius Ellipſis deſcribetur,
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licet non tam facile, inſtrumento, quod Guidus V baldus è Marchionibus Montis, vir hac ętate non minus
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ingenij, at que doctrinæ præstantia, quàm generis nobilitate clariſſimus, in Theorica planiſphęriorum vni-
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uerſalium, quæ nuper ab eo edita est, inuenit, & </
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<
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<
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">INSTRVMENTV Minſtar circini in proxima figura eſt S T V, cuius crura reſecta ſunt in T,
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& </
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">V, fruſta autẽ abſciſſa T a, V b, ita aptata in T, & </
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<
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">V, vt liberè hinc inde moueri poſſint, & </
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lis astringi. </
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canaliculũ etiã habens in f, vt circa filum extentum commodè poſſit cir cumagi, ita vt filũ ſemper triangu-
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lum conſtituat angulos habens in canaliculis circini, & </
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ſtylo poſito in A, vel B, triangulũ non conſtituitur, ſed linea recta. </
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eſſe debent, & </
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a meridie vel
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media nocte
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qui ſint.</
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los Aequatoris incedentes, ſecantesq́; </
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<
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">parallelum, qui Horizontẽ tangit,
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eſtq́; </
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indicant horas æquales à meridie, vel media nocte initium habentes.</
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">SECENT parallelum A B C D, cuius centrum E, omnium ſemper apparentiũ maximum,
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quiq́; </
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">tangit Horizontem F G, (tangit inquam in puncto, in quo recta H I, communis ſectio plani
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Horizontis, & </
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zontem F G, & </
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">circulum A B C D,) circuli maximi, quorũ vnus ſit Meridianus, per polos Aequa-
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toris, ac proinde & </
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