PAL

Ptolemaeus Arabus et Latinus

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Federico Commandino, In Planisphaerium Ptolemaei commentarius

Venice, Paulus Manutius Aldi, 1558 · 12v

Facsimile

Sit circulus ABCDLMNO super horizontem elevatus, et diametri ipsius AL; punctum L sit in plano, in quo linea FG, punctum vero A ab eo elevatum ut angulum faciat ALZ, et descripta figura in tabula KG, quae sit PQRSTUXY, ducantur lineae AE, EL. Itaque si planum, in quo circulus ABCDLMNO sit, tabulae aequidistans, erit figura PQRSTUXY circulus ex quarta primi conicorum; nam conus EAL secabitur plano aequidistanti basi. Si vero non sit aequidistans et communis eorum sectio sit recta linea perpendicularis ad basim trianguli per axim, vel ad ipsam productam, talis figura vel circulus erit, vel ellipsis; circulus quidem cum tabulae planum plano basis subcontrarie ponatur