《Tetrabiblos》Number Of The Modes Of ProrogationClaudius Ptolemy（Ashmand 英譯 1822）
The seventeen times must, therefore, be again multiplied by the three hours, and the first point of Gemini, at its second position, will be found to be past the meridian, at the distance of 51 times.[178] The distance of 13 times of the first position and 51 times of the second position are then both to be taken; and they will produce 64 times.
段落 tetra-3-numberofth-54public-domain (Ashmand 1822)
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