《Tetrabiblos》Signs Beholding Each Other, And Of Equal PowerClaudius Ptolemy（Ashmand 英譯 1822）
Any two signs, equally distant from either tropical sign, are equal to each other in power; because the Sun, when present in one, makes day and night, and the divisions of time, respectively equal in duration to those which he produces when present in the other.
段落 tetra-1-signsbehol-1public-domain (Ashmand 1822)
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