《Tetrabiblos》Tropical, Equinoctial, Fixed, And Bicorporeal SignsClaudius Ptolemy(Ashmand 英譯 1822)
Among the twelve signs, some are termed tropical, others equinoctial, others fixed, and others bicorporeal. The tropical signs are two: viz.
段落 tetra-1-tropicaleq-1public-domain (Ashmand 1822)
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