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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<
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">IN hoc horologio cadunt omnes horæ tropici ♑, ſupra faciem inferiorem plani propoſiti:
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<
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">quia ab eo non ſecatur, ſed totus ſub ipſo occultatur, quemadmodum & </
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<
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">tropicus ♋, totus ſupra
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ipſum extat. </
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<
s
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">Hinc fit, vt nulla men@o fiat horarum tropici ♑, in iſtis tabellis. </
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<
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vmbra gnomonis, Sole exiſtente
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incipio ♋, Ellipſim, licet in horologio, propter ſpatij an-
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guſtias, integra non appareat.</
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<
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">DVCTA ergo in plano horologij recta A B, quę in plano ſtabili ſit Horizonti æquidiſtans,
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log@@ deci
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inãtis
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à ſeptẽtr. in or.
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g@. 30 & ad H@
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@zontem incli-
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nati gr. 52. M. 3.
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@ tabulis.</
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aſſumptoq́ue in ea loco ſtyli C, deſcribatur ex C, circulus quicunque A D B E, in quo recta D E,
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ſecet ipſam A B, ad angulos rectos in centro, tanquam communis ſectio plani horologij, & </
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culi maximi inclinationem ad Horizontem metientis. </
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<
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cu circuli maximi, cui horologium æquidiſtat, inter maximum circulum, qui inclinationem me
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titur, & </
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tabimus eum à D, verſus A, partes orientales, vt in proximo horologio diximus, (cadit enim & </
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in hoc horologio centrum inſra ſtylum, & </
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<
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ter ipſum, & </
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<
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<
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48. </
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<
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<
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">vſque ad F. </
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<
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">Recta enim F C G, erit linea ſtyli, ſiue communis ſectio plani horologij,
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& </
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<
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">Meridiani proprij ipſius: </
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<
s
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">Et à recta H I, ſecante rectam F G, ad angulos rectos in C, tanquam
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communi ſectione plani horologij, & </
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<
s
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vmbrarum. </
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<
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">Diuiſa deinde recta H I, in partes ſtylo æquales, vt iam ſæpe factum eſt; </
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<
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per propoſ. </
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<
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<
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<
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<
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">altitudine poli ſupra planum horologij, quam in noſtro exemplo reperi-
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mus continere gr. </
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<
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<
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<
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<
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ſtyli in linea ſtyli ſurſum verſus ſupputemus vmbram Par. </
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<
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<
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<
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dinis poli inuentæ debetur, inuen iemus punctum K, per quod linea æquinoctialis ad F G, ducẽ-
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<
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ctialis.</
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da eſt perpendicularis: </
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<
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xml:space
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">Et ſi deorſum verſus accipiamus vmbram C L, Par. </
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<
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<
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<
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poli inuentæ reſpondentem, inuentum erit L, centrum horologij, per quod ſi ducamus ad F G,
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<
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logii.</
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perpendicularem M N, computandi erunt arcus horarij, ſi pro ſingulis horis ſupputati fuerint à
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punctis M, N, in circulo ex L, deſcripto. </
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<
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H I, accipiatur recta C O, gnomoni æqualis, fiatq́ue angulus C O K, altitudinis poli inuentæ, & </
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angulus C O L, complementi eiuſdem altitudinis.</
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<
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">SI iam à punctis H, I, ſupputentur, latitudines vmbrarũ, obſeruando diligenter, quæ orien-
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tales ſint, occidentalesve, & </
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<
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">quæ ſuperiores, in ferioresve, conſtruetur horologiũ, vt in præceden-
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tibus. </
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<
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<
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talis.</
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horam 6. </
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<
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<
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">indicat, æquinoctialem lineam ſecat, parallela rectę A B, vel per-
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pendicularis ad D E, tranſiens omnino per punctum P, quod in recta C E terminat vmbram Par.
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<
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<
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<
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<
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<
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ſi in recta AB, ſumatur C Q, ſtylo æqualis, conſtituaturq́ue angulus C Q P, complementi </
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