《Tetrabiblos》Number Of The Modes Of ProrogationClaudius Ptolemy（Ashmand 英譯 1822）
For, if it be desired to calculate agreeably to nature, every process of calculation that can be adopted must be directed to the attainment of one object; that is to say, to ascertain after how many equatorial times[157] the place of the succeeding body, or degree, will arrive at the position preoccupied at the birth by the preceding body, or degree: and, as equatorial time transits equally both the horizon and the meridian, the places in question[158] must be considered, in respect of their proportionate distances from both these; each equatorial degree[159] being taken to signify one solar year.
段落 tetra-3-numberofth-23public-domain (Ashmand 1822)
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