《Tetrabiblos》Otherwise Called, The Fruit Of His Four BooksClaudius Ptolemy（Ashmand 英譯 1822）
LXXXI. Times are reckoned in seven ways; viz. by the space between two significators; by the space between their mutual aspects; by the approach of one to the other; by the space between either of them and the place appropriated to the proposed event; by the descension of a star, with its addition or diminution; by the changing of a significator; and by the approach of a planet to its place.
段落 tetra-4-otherwisec-81public-domain (Ashmand 1822)
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