《Tetrabiblos》Number Of The Modes Of ProrogationClaudius Ptolemy（Ashmand 英譯 1822）
22, Cooper’s Translation), and he has fully exemplified this principle in other parts of his “Primum Mobile”; but Ptolemy here speaks only of _one_ of the _semi_circles between the horizon and meridian, without reference to any other semicircle, corresponding in distance from the horizon and mid-heaven; and all that he has said on the subject amounts only to this, that the prorogation is completed when the succeeding place arrives at the same semicircle on which the preceding place had been posited.
段落 tetra-3-numberofth-38public-domain (Ashmand 1822)
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