《Tetrabiblos》Number Of The Modes Of ProrogationClaudius Ptolemy（Ashmand 英譯 1822）
[181] Oblique ascension. [182] The times of oblique descension of any arc of the zodiac are equal to the times of oblique ascension of its opposite arc; as before explained.
段落 tetra-3-numberofth-65public-domain (Ashmand 1822)
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