《Tetrabiblos》The Time And Period Of The EventClaudius Ptolemy（Ashmand 英譯 1822）
[87] The three periods of four months each, stated in this paragraph, are applicable to solar eclipses only; for lunar eclipses, these periods may be reckoned at ten days each; that number of days bearing the same proportion to a month, as four months to a year.
段落 tetra-2-thetimeand-10public-domain (Ashmand 1822)
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