PAL

Ptolemaeus Arabus et Latinus

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Ptolemy, Almagesti (tr. Erasmus Reinhold)

Wittenberg, Johannes Lufft, 1549 · 120v

Facsimile

〈I.13〉 CAPUT XIII: De ascensionibus in recta sphaera

Sequitur deinceps, ut una demonstremus quantitates circumferentiarum circuli aequinoctialis factas a circulis qui transeunt per polos aequinoctialis et per quaecunque segmenta obliqui circuli proposita. Sic enim habebimus, in quot temporibus aequinoctialibus segmenta circuli qui est per medium signorum pertranseant meridianum ubique, propterea quod is horizon solus tunc describitur per polos aequinoctialis.

Proponatur Partes 30 Zodiaci. Ratiocinatur ex primo theoremate sphaerico, scilicet, κατὰ διάιρεσιν i. m. W ergo figura prius descripta, et data rursus circumferentia EI obliqui circuli, primum 30 partium, invenienda sit circumferentia aequinoctialis ET. Itaque eodem modo, ut supra, ratio sub-