《Tetrabiblos》Number Of The Modes Of ProrogationClaudius Ptolemy（Ashmand 英譯 1822）
The distances, in temporal hours, of the preceding degree from each of these angles, are then to be ascertained; and whatever proportion these same temporal hours, contained in such distances between the said preceding degree and each angle, may bear to the temporal hours of the whole quadrant, the same proportion, out of the excess of the times of distance of one angle over those of the other, is either to be added to, or deducted from, the actual number of times of the respective angles.
段落 tetra-3-numberofth-62public-domain (Ashmand 1822)
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