《Tetrabiblos》Signs Commanding And ObeyingClaudius Ptolemy（Ashmand 英譯 1822）
Any two signs configurated with each other at an equal distance from the same, or from either equinoctial point, are termed commanding and obeying, because the ascensional and descensional times of the one are equal to those of the other, and both describe equal parallels.
段落 tetra-1-signscomma-1public-domain (Ashmand 1822)
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