PAL

Ptolemaeus Arabus et Latinus

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Federico Commandino, In Planisphaerium Ptolemaei commentarius

Venice, Paulus Manutius Aldi, 1558 · 22r

Facsimile

parte G sumantur arcus aequales GN, GH. Secundum declinationem horizontis, modoque superius dicto, circuli aequidistantes describantur KM, CL, et in medio lineae CM sumpto centro R, describatur alius circulus CM. Erit ipse CM pro horizonte, quod ita demonstrabitur. Sit rursus sphaera αβγδ et alia, ut in superiori figura, sitque plani ducti per meridianum αβγδ et horizontis communis sectio πρ, et ducatur πδ, quae secet αγ in σ et δρ. Producatur ad eandem in τ et describatur circulus πρ in plano per αγ oculo in δ posito. Erit descripta figura circulus circa diametrum στ; planum enim πρ plano αγ subcontrarie ponitur, quod facile demonstrabimus, ducta ρυ aequidistanti ipsi αγ. Sicuti superius demonstratum est, planum ηθ eidem plano αγ subcontrarie

poni. Rursus, cum aequinoctialis circulus ABGD meridiano αβγδ aequalis sit, similiter demonstrabimus lineam EC lineae εσ et EM ipsi ετ aequalem esse, et idcirco CM ipsi στ erit; igitur circulus circa CM in plano descriptus loco horizontis, et eadem ratione secabit circulum aequinoctialem et zodiacum semper bifariam in oppositis punctis, ut contingit in solida sphaera.

D. Describatur enim circulus aequinoctialis, etc.]

Quod dixerat superius nunc demonstratione confirmat, videlicet omnes rectas lineas quae per polum transeunt, instar meridia-