《Tetrabiblos》The Zodiacal PlanisphereClaudius Ptolemy（Ashmand 英譯 1822）
Now it is required to bring 0° ♊ to the 7th house (the place of 0° ♉), and it will be there on arriving at H, distant from B 102° 39′ of the equator; but as 0° ♊ is already at G, the distance from G to H, equal to 70° 23′ of the equator, is the amount of the prorogation between 0° ♉ and 0° ♊, when 0° ♉ is on the 7th house.
段落 tetra-4-thezodiaca-12public-domain (Ashmand 1822)
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