《Tetrabiblos》Number Of The Modes Of ProrogationClaudius Ptolemy（Ashmand 英譯 1822）
[163] The ascendant, mid-heaven, and western horizon; as mentioned in the preceding paragraph. There is, however, a method by which the proportion of time, occupied in the progress of a succeeding place to a prorogatory and preceding place, in whatever position, whether oriental, meridianal, or occidental, or any other, may be easily calculated.
段落 tetra-3-numberofth-39public-domain (Ashmand 1822)
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