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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dicam eius quantit atem non contineatur, animo tamen ipſum concipere licebit, Igitur angulus E A F.
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<
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">altitudini poli æqualis crit, cum E A F, A E F, vni recto ſint æquales, & </
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xml:space
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titudinis poli æqualis; </
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<
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">ac propterea ſi triangulum E A F, intelligatur circa lineam meridianam A E, cir-
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cumduci, quoad rectum ſit ad planum borologij, & </
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<
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">in plano Meridiani exiſtat, erit A F, axis mundi;
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quia in plano Meridiani cum meridiana linea Horizontis, quæ ipſi A B, in plano horologij æquidiſt@t,
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(propterea quòd ambæ ſint ſectiones factæ à Meridiano in planis parallelis) angulum facit angulo E A F,
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altitudinis poli æqualem, nempe externum interno. </
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<
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">Quocirca rectæ F E, G H, ad axem F G, perpendicu-
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lares, communes ſectiones erunt Meridiani, & </
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">Aequatoris, ita vt vtrumque punctorum F, G, pro cen-
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tro mundi ſumatur. </
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">oſtenſum eſt, circuli horarij occurrent plano horo-
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logij in punctis, quæ in rectis C D, I K, reperimus, & </
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">F M, erit ſtylus, eiuſ{q́ue} locus in M. </
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<
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xml:space
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">Sunt enim triã-
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gula A E F, A H G, ita conſtructa hoc loco, vt triangulum H I D, in ſuperiori horologio huius propoſ.</
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">IN hoc propoſito exemplo, quia altitudo poli eſt magna ſatis, continetur centrum horologij A, ad
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quod omnes lineæ horariæ tendunt. </
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<
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">Quod eo conſilio factum eſt, vt experientia etiam diſceres, rectè hac
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ratione horologia deſcribi. </
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<
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">Liquido verò conſtat, ſi centrum in planum horologij non cadit, ſextam horã,
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quæ per centrum horologij neceſſario ducitur ad meridianam lineam perpendicularis, deſcribi non poſſe.
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logii horizonta
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lis, cum polial-
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titudovalde ma
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gna eſt.</
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Atque hæc de remedio prioris incommodi.</
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<
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ridiana linea A B, & </
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