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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num horologij Verticali æquidiſtans rectum eſt ad Meridiani planum; </
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Aequatoris, ac plani horologii ad idem planum Meridiani, ideoq́; </
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ad lineam meridianam H I, in plano Meridiani exiſtentem, perpendicularis in puncto I, in quo
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Aequator lineæ meridianæ in horologio occcurrit, vt dictum eſt. </
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logio per I, ad meridianam lineam H I, perpendicularis eſt ducta, communis ſectio eſt Aequato-
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ris, & </
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">Circa quam ſi moueri intelligatur planum cir-
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culi ex centro E, deſcripti, donec cum mundi centro D, in triangulo D H I, (quod rectum eſſe di-
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ximus ad planum horologii, & </
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">in plano Meridiani exiſtere, vnà cum tota portione Analemmatis,
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quamuis ſolum triangulum in horologio deſcriptum ſit) coniungatur E, centrum circuli, propte-
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rea quòd rectę D I, I E, æquales ſunt, ex conſtructione, & </
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">in illo motu circuli ex E, deſcripti recta
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I E, ſem per maneat in plano Meridiani, in quo exiſtit D I, erit ipſe circulus circa D, centrum mun-
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di, ſeu Aequatoris deſcriptus, & </
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">in plano eiuſdem Aequatoris exiſtens, cùm Aequatoris planum
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per rectas D I, I K, ducatur, quemadmodum & </
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ctus; </
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D, centrum mundi. </
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">Intelligatur quoque I E, protracta in vtramque partem in eadem poſitione,
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quippe quę ſimul cum circuli plano moueatur tanquam communis ſectio Meridiani, & </
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ris, cum tam Meridianus, quàm Aequator in huiuſmodi poſitione per rectam D I, vel I E, trãſeat.
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