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 SECVNDVS.</
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CHRISTOPHORO CLAVIO BAMBER GENSI SOCIETATIS IESV.</
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problematibus, quæ vel neceſſaria, vel vtilia fore iudicaui-
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mus, vt eſſent veluti baſis, ac fundamentum omnium demon
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ſtrationum, quas ad horologiorum deſcriptiones adhibituri
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ſumus, aggrediemur iam ſecundo hoc libro ad deſcriptionein
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horologiorum, quæ in ſuperficiebus planis ſolent depingi: </
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quarum ſingulis, quæ quidem multæ ſunt, vt in principio dixi-
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xml:space
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lis planis horo-
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logiorũ deſcri-
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batur in hoc e
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-
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per@.</
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mus, non ſolum horas (quod cæteri fere omnes ſcriptores tan
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tum fecerunt) deſcribemus, ſed vt, quoad eius fieri poteſt, no-
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ſtra hæc Gnomonica reddatur quàm abſolutiſſima, duodecim problemata demon-
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ſtrabimus, quibus explicentur, quæcunque ferme ex gnomonis vmbra cognoſci
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poſſe videantur, hoc ſemper ordine, qui ſequitur, ſeruato.</
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<
s
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">PRIMVM docebimus, quanam ratione in plano propoſito quocunque borologiũ Aſtro
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">Horæ à mer.
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uel med. noc.</
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nomicum, continens nimirum lineas horarum à meridie, vel media nocte (quæ nihil ſunt
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aliud, quàm communes ſectiones plani horologij, & </
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">circulorum maximorum, qui per po-
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los mundi ducuntur, diuidunt{q́ue} Aequatorem, & </
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<
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æquales) deſcribatur.</
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<
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">DEINDE, quaratione in eodem plano paralleliper initia ſignorum Zodiaci, vel
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arcus ſignorum
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Zodiaci.</
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per quę cunque alia puncta tranſeuntes delineentur, trademus: </
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">qui quidem paralleli ab artificibus arcus
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ſignorum dicuntur, ſunt{q́ue} in plano dato vel circuli, vel parabolę, vel hyperbolæ, vel Ellipſes, nempe ſe-
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ctiones communes plani horologij, & </
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">ſuperficierum conicarum, quarum baſes ſunt dicti paralleli ſignorũ
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Zodiaci, vertex autem centrum mundi, excepto parallelo per principia ♈, & </
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Aequatore non differat, efficit lineam rectam in plano propoſito, vt libro ſuperiore demonſtr auimus.</
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diurnorum.</
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paralleli à punctis Zodiaci ad motum primi mobilis deſcripti, non tamen neceſſario per initia ſignorum
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ducuntur, quamuis hoc poſſit aliquando contingere, ſed per illa puncta Eclipticæ, in quibus Sol exiſtens
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efficit diem datarum horarum, vt 12. </
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<
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">vel denique quotcunque quis voluerit, dummo
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do numerum 24. </
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<
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">horarum non ſuperent. </
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vel parabolæ, vel hyperbolæ, vel ellipſes, excepto parallelo horarum 12. </
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cit in horologij plano lineam rectam, vt diximus.</
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<
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euli.</
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ctiones plani horologij, & </
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<
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zontis, quos Al
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mucãtarath di-
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cunt.</
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cantarath vocant, qui in plano propoſito (vt de parallelis ſignorum Zodiaci, & </
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ctum eſt) ſunt communes ſectiones plani horologij, & </
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<
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">conicarum ſuperficierum, quarum baſes ſunt dicti
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paralleli Horizontis, vertex autem centrum mundi, nimirum vel circuli, vel parabolæ, vel hyperbolæ,
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vel ellipſes, excepto Horizonte, qui cum ſit circulus maximus, rectam lineam in plano efficit.</
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culi.</
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tius mundi, qui ſunt in plano lineæ rectæ inſtar linearum horarum à meridie, vel media nocte.</
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<
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dinum, ſeu ciui
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tatum.</
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titudinum, in eodem plano, qui videlicet per locorum vertices ducuntur, efficiunt{q́ue} in plano horologij
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vel circulos, vel parabolas, vel hyperbolas, vel Ellipſes, vt paralleli ſignorum Zodiaci, vel arcuum
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diurnorum.</
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<
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">AD hæc, in octauo problemate deſignabimus domos cęleſtes, id eſt, lineas rectas, quę ſunt communes
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ſtes.</
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ſectiones plani horologij, & </
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