《Tetrabiblos》The Periodical Divisions Of TimeClaudius Ptolemy（Ashmand 英譯 1822）
In other declinations, however, between these extreme positions of the equator, as just mentioned, there are certain of the circles always visible, and others never visible; consequently, the stars intercepted between the first of such circles and the poles can neither rise not set, but must, in the course of one revolution, twice transit the meridian; above the earth, if the said stars be on a circle always visible; but below the earth, if on a circle never visible.
段落 tetra-4-theperiodi-60public-domain (Ashmand 1822)
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