《Tetrabiblos》Otherwise Called, The Fruit Of His Four BooksClaudius Ptolemy（Ashmand 英譯 1822）
LXXXVI. The Sun is the source of the vital power; the Moon, of the natural power. LXXXVII. Monthly revolutions are made in twenty-eight days, two hours and about eighteen minutes.
段落 tetra-4-otherwisec-86public-domain (Ashmand 1822)
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