《Tetrabiblos》The Periodical Divisions Of TimeClaudius Ptolemy（Ashmand 英譯 1822）
And in that part of the earth where the equator is in the zenith, the whole of the fixed stars are found to rise and set, and to be above as well as below the earth, once in each revolution; because the situation of the poles of the equator, being in this manner on the plane of the horizon, thereby prevents the constant visibility or invisibility of any one of the parallel circles.
段落 tetra-4-theperiodi-58public-domain (Ashmand 1822)
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