《Tetrabiblos》Number Of The Modes Of ProrogationClaudius Ptolemy（Ashmand 英譯 1822）
But, should the preceding degree be between any two of these angles, as, for instance, at the distance of Aries, just spoken of, the proper times for each angle must first be considered.
段落 tetra-3-numberofth-60public-domain (Ashmand 1822)
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