《Tetrabiblos》The Periodical Divisions Of TimeClaudius Ptolemy（Ashmand 英譯 1822）
Of this aspect, one kind is called a visible vespertine location in the mid-heaven; when the star is found there immediately after sunset: another is the precise vespertine location in the mid-heaven; when the star is found there at the moment of sunset; another is the vespertine precedent location in the mid-heaven, invisible; when the star arrives there immediately before sunset.
段落 tetra-4-theperiodi-82public-domain (Ashmand 1822)
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