《Tetrabiblos》The Periodical Divisions Of TimeClaudius Ptolemy（Ashmand 英譯 1822）
Of this, one is diurnal and invisible; when the star rises while the Sun is posited on the meridian above the earth: another is nocturnal and visible; when the star rises while the Sun is placed on the meridian below the earth.
段落 tetra-4-theperiodi-74public-domain (Ashmand 1822)
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