《Tetrabiblos》Number Of The Modes Of ProrogationClaudius Ptolemy（Ashmand 英譯 1822）
When the prorogator has been determined as above directed, it is also necessary to take into consideration the two modes of prorogation; one into succeeding signs, under the projection of rays, as it is called; and, when the prorogator may be in an oriental place, that is to say, in any place between the mid-heaven and the ascendant, this mode only is to be used.
段落 tetra-3-numberofth-1public-domain (Ashmand 1822)
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