《Tetrabiblos》That Prescience Is UsefulClaudius Ptolemy（Ashmand 英譯 1822）
It is its polarity that was not known until the 11th or 12th century; and the French say that the earliest notice of that polarity is found in a poem of Guyot of Provence, who was at the Emperor Frederick’s Court at Mentz in 1181.—See the French Encyclopædia, &c.
段落 tetra-1-thatpresci-26public-domain (Ashmand 1822)
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