《Tetrabiblos》The Periodical Divisions Of TimeClaudius Ptolemy（Ashmand 英譯 1822）
Of this aspect, two sorts are diurnal and invisible; when the star is on the meridian above the earth, together with the Sun, or on that below the earth, diametrically opposite to the Sun.
段落 tetra-4-theperiodi-76public-domain (Ashmand 1822)
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