Clavius, Christoph
,
Geometria practica
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GEOMETR. PRACT.
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<
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Theorema valdè vtile eſt ad deſcriptionem paralleli cuiuſuis circuli
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maximi per datum punctum in Aſtrolabio, vt ex propoſ. </
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ſpicuum eſt: </
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quæ ex Aſtrolabij deſcriptione pendent.</
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<
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datam rectam ab Alberto Durero traditam, & </
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chitecti, atq; </
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hæc eſt. </
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AB, deſcribantur duo circuli ſe ſe interſecantes in C, D. </
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tacunque, deſcribatur eodem interuallo AB, ex C, per A, B, circulus rectam CD,
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in E, & </
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cantes priores circulos in H, I. </
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ſcripti ſe ſe interſecent in K@ iunganturque rectæ AI, IK, KH, HB. </
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rerus, pentagonum ABHKI, eſſe æquilaterum, & </
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eſt. </
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">quod vt manifeſtum fiat, demonſtranda ſunt prius nonnulla.</
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<
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<
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tres FA, AB, BG, ſextæ partes circuliſunt, quod rectæ eos ſubtẽ-
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dentes ſemidiametri ſint circuli FABG, ex conſtructione. </
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/388-01
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circulus eſt, cuius diameter FG; </
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tertij.</
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FEG, in ſemicirculo rectus: </
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quoniã, vt conſtat ex demonſtratione praxis ſcho-
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lij propoſ. </
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ctam AB, bifariam in M, & </
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tertij.</
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ctos in C. </
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les erunt, videlicet quadrantes; </
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primi.</
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pti, eiuſque diameter FG. </
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<
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<
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erunt quo que O E M, NEM, ſemirecti; </
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qualia: </
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NA, æquales erunt. </
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laterib. </
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quialatera AN, AI, lateribus BO, BH, æqualia ſunt; </
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guli N, O, ſemirecti æquales, & </
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cto; </
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