《Tetrabiblos》Number Of The Modes Of ProrogationClaudius Ptolemy（Ashmand 英譯 1822）
It must necessarily vary in all other parallels of declination, and also in all other latitudes. There is, however, another method which may be used, and which is still more simple; for instance, should the preceding degree be on the ascendant, the following intermediate times of ascension,[181] between it and the succeeding degree, may be reckoned; should it be on the mid-heaven, the times of ascension must be reckoned on a right sphere; and, if it be on the west, descending, the intermediate times of descension[182] are to be reckoned.
段落 tetra-3-numberofth-59public-domain (Ashmand 1822)
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