Ptolemaeus Arabus et Latinus

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Pseudo-Ptolemy, Liber proiectionis radiorum stellarum

Vatican, BAV, Reg. lat. 1285 · 138v


arcum noctis gradus ipsius planete multiplicabis, et quod collectum fuerit per equatam radiationem divides et quod exierit erit equatio radiationis. Si autem ipse planeta fuerit inter gradum septimi et gradum anguli terre, minues equationem radiationis de loco radiationis secunde. Et si inter gradum anguli terre minues… terre] section omitted by the scribe, who added below the text V et gradum ascendentis fuerit, eum prime superaddes et quod collectum fuerit erit locus radiationis equate.