《Tetrabiblos》The Zodiacal PlanisphereClaudius Ptolemy（Ashmand 英譯 1822）
In the second example, 0° ♉ is placed on the mid-heaven, which position must be at D, so that 0° ♊ must necessarily be at E; and the distance from E to B, equal to 57° 44′ of the equator, is the prorogation between 0° ♉ and 0° ♊, when 0⁴ ♉ is on the mid-heaven.
段落 tetra-4-thezodiaca-10public-domain (Ashmand 1822)
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