《Tetrabiblos》The Time And Period Of The EventClaudius Ptolemy（Ashmand 英譯 1822）
The second point requiring attention relates to time, and indicates the date when the event will take place, and the period during which its effect will continue: these are to be ascertained in the following manner.
段落 tetra-2-thetimeand-1public-domain (Ashmand 1822)
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