《Tetrabiblos》The Zodiacal PlanisphereClaudius Ptolemy（Ashmand 英譯 1822）
Now 0° ♊ will be on the ascendant when it arrives at the point G; therefore the distance from A to C is the amount of the prorogation between 0° ♉ (when posited on the ascendant) and 0° ♊, and it is equal to 45° 5′ of the equator.
段落 tetra-4-thezodiaca-9public-domain (Ashmand 1822)
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