《Tetrabiblos》Number Of The Modes Of ProrogationClaudius Ptolemy（Ashmand 英譯 1822）
And the distance between Sun-rising and setting, is the diurnal arc which the meridian cuts in two equal parts. In directions, these mundane parallels have a twofold consideration: first, simple; secondly, according to the rapt motion of the earth, or the _primum mobile_: all which have been largely explained by the learned Monk, Placidus,” &c.
段落 tetra-3-numberofth-36public-domain (Ashmand 1822)
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