《Tetrabiblos》The Periodical Divisions Of TimeClaudius Ptolemy（Ashmand 英譯 1822）
And, with regard to periods reckoned by months, the same rule is to be observed: for in this case also, the number of the month, as counted from the month of the nativity, is to be projected from such places as possess the dominion of the year, in the proportion of twenty-eight days per sign.
段落 tetra-4-theperiodi-30public-domain (Ashmand 1822)
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