《Tetrabiblos》Book 1Claudius Ptolemy（Ashmand 英譯 1822）
PROEM The studies preliminary to astronomical prognostication, O Syrus! are two: the one, first alike in order and in power, leads to the knowledge of the figurations of the Sun, the Moon, and the stars; and of their relative aspects to each other, and to the earth: the other takes into consideration the changes which their aspects create, by means of their natural properties, in objects under their influence.
段落 tetra-1-ch-1public-domain (Ashmand 1822)
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