《Tetrabiblos》The Zodiacal PlanisphereClaudius Ptolemy（Ashmand 英譯 1822）
If 0° ♉ be on the cusp of the 8th, it must be at O, and 0° ♊ will be at P, distant 66 equatorial degrees from R, which is also on the cusp of the 8th: these two several numbers of degrees will be the respective prorogations between 0° ♉ and 0° ♊, when 0° ♉ is placed on the 9th and 8th houses.
段落 tetra-4-thezodiaca-16public-domain (Ashmand 1822)
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