PAL

Ptolemaeus Arabus et Latinus

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Federico Commandino, In Planisphaerium Ptolemaei commentarius

Venice, Paulus Manutius Aldi, 1558 · 21v

Facsimile

C. Designabitur deinde omnis horizon etc.］

Transit Ptolemaeus ad descriptionem horizontis, qui cum ab aequinoctiali circulo declinet, quemadmodum zodiacus et ipse per circulos aequinoctiali aequidistantes describendus est secundum aliam atque aliam declinationem pro loci cuiusque situ. Et cum sit unus

ex circulis maioribus aequinoctialem et zodiacum bifariam secat, sit enim aequinoctialis circulus ABGD, cuius centrum E, et diametri sese secantes ad angulos rectos AG, BD et ex utraque