《Tetrabiblos》The Periodical Divisions Of TimeClaudius Ptolemy（Ashmand 英譯 1822）
So, in the example before proposed, the last 15° of Gemini, and the first 15° of Cancer, shall serve for the first month: the last 15° of Cancer and the first 15° of Leo, for the second month; and so on.
段落 tetra-4-theperiodi-33public-domain (Ashmand 1822)
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