《Tetrabiblos》Number Of The Modes Of ProrogationClaudius Ptolemy（Ashmand 英譯 1822）
[148] By the apparent motion of the planetary system. On this passage, Placidus has the following observations: “In directing the significator to the west, you must consider what stars or mundane rays are intercepted between the significator and the west; if fortunate, add their arc to the significator’s arc of direction to the west; if unfortunate, subtract it from the same, and it will give the arc of direction, augmented or diminished according to Ptolemy.
段落 tetra-3-numberofth-7public-domain (Ashmand 1822)
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