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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eos ducit per partes æquales Aequatoris, quàm ſecundum Campani ſententiam, qui eoſdem per partes
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æquales Verticalis circuli primarij ducendos eſſe cenſet.</
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<
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xml:space
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">PRAETEREA in problemate nono trademus modum, quo in eodem plano propoſito deſcribere
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tia.</
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poſſimus aſcendentia ſigna Zodiaci, hoc eſt, lineas rectas, quæ communes ſectiones ſunt plani horologij, & </
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Eclipticæ, prout varios ſitus, ac poſitiones habet in Horizonte, dum initia ſignorum Zodiaci ſupra Hori-
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zontem emergunt.</
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<
s
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">DECIMO loco horologium Italicum, continens nimirum horas ab occaſu Solis, quarum vſus ho-
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Solis.</
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die in Italia maxime & </
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<
s
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xml:space
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">IN ſequenti verò problemate vndecimo conſtituemus horologium Babylonicum in eodem plano, com
<
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Solis.</
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plectens videlicet horas ab ortu Solis, quibus nostra tempeſtate inſulæ Baleares vtuntur.</
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<
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">Horæ antiquæ,
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ſiue inæquales.</
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quæ olim apud Veteres vbique fere gentium in vſu fuerunt.</
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<
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">IN hiſce autem duodecim rebus in omni plano propoſito deſcribendis, vtemur ſemper demonſtra-
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tionibus Geometricis, ne in deſcriptione ipſa quicquam in dubium quæſtionem{q́ue} horologiographus vocare
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poſſit. </
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<
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">Vſus quoque omnium explicabitur in proprijs propoſitionibus horologiorũ horizontalium, de qui-
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bus primo loco dicturi ſumus, qui in omnibus alijs horologijs eodem modo intelligendus erit.</
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<
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">ITAQVE ſecundus hic liber complectetur omnia illa horologia, quæ in plano, quod vel Horizon-
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">Argumentum
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libri ſecundi.</
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tis, vel Verticali propriè dicto, vel Meridiano, vel circulo horæ ſextæ à meridie vel media nocte, vel de-
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nique Aequatori æquidiſtat, deſcribi ſolent: </
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<
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xml:space
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">quod quidem planum, cuicunque maximo circulo ex nomina-
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tis æquidiſtet, perpetuo vnum, & </
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<
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">idem eſt, nunquam ſitum mutans in eodem climate. </
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<
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rologia, quorum plana circulis maximis æquidiſtant, qui vel declinant à Verticali, vel ab Horizonte, vel
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ad Horizontẽ ſunt inclinati, vel denique & </
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<
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tem, intertium librum reijciemus: </
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<
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">quæ quidem in eodem climate ſexcentis modis variari poſſunt. </
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<
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verbi gratia, circulus maximus à Verticali declinans, cui horologium æquidiſtat, declinare poteſt in ortũ
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vel occaſum, vno duntaxat gradu, vel duobus, vel tribus, quatuor, quinque, ſex, & </
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<
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90. </
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<
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">horologium illi æquidiſtans tot modis etiam variabitur, licet in eodem ſemper climate, ſiue
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eadem altitudine poli permaneamus. </
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<
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<
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ſctibendi horo-
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logij Aſtrono-
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mici in quoli-
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bet plano ma-
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gis probetur.</
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inter omnes illa ratio magis mihi probatur, (vt etiã hac in parte ſtudioſo Lectori ſignificem, qua potiſſi-
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mum via in horologiorum deſcriptionibus progrediendum eſſe cenſeam) quæ longitudinem ſtyli datam,
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eius{q́ue} locum datum accipit, vt horologium deſcribat; </
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<
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horologij deſcriptam. </
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<
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uauimus. </
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<
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logiorum, quæ deſcribuntur propoſ. </
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<
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<
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<
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<
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<
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<
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</
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<
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<
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<
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<
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in ſcholijs propoſitionum 1. </
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<
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<
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num 25. </
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<
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<
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xml:space
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">Quod vero attinet ad horas ab ortu, & </
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ſemper modum illum, quem libro 5. </
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<
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beantur in promptu, quas quidem in eodem lib. </
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<
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nium facillimus, & </
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<
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<
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xml:space
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">NON explicauimus autem duas illas rationes deſcribendi horologij Aſtronomici in ipſis propoſitio-
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nibus, ſed eas in ſcholia reiecimus; </
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<
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xml:space
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">quoniam deſcriptiones in propoſitionibus expoſitę ab omnibus fere ar-
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tificibus vſurpantur, licet in illis etiam aliqua immutauerimus. </
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<
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xml:space
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">Vnde viſum eſt, priori loco illas Geome
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tricis demonstrationibus corroborare. </
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<
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ſe inuenimus.</
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<
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PROBLEMA 1. PROPOSITIO 1.</
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no, quod Horizonti æquidiſtat, deſcribere.</
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tionis Analem-
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matis.</
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Horizontis; </
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toris; </
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FD, ad partes D, ſumatur in A D, producta gnomoni horologij futuri, cuiuſcunque is magnitu-
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dinis fuerit, æqualis recta D G, & </
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