《Tetrabiblos》The Periodical Divisions Of TimeClaudius Ptolemy（Ashmand 英譯 1822）
6. The sixth is meridianal setting; when the star is found on the occidental horizon, while the Sun is on the meridian. Of this, one species is diurnal and invisible; when the star sets while the Sun is above the earth on the meridian: the other is nocturnal and visible; when the star sets while the Sun is on the meridian below the earth.
段落 tetra-4-theperiodi-78public-domain (Ashmand 1822)
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