《Tetrabiblos》The Periodical Divisions Of TimeClaudius Ptolemy（Ashmand 英譯 1822）
But in all other declinations, the time of passage of a semicircle above the earth is not equal to that of its passage below the earth, except only in the case of the equinoctial circle itself, which, in an oblique sphere, is the only one divided by the horizon into two equal parts, all others (its parallels) being bisected into dissimilar and unequal arcs.
段落 tetra-4-theperiodi-64public-domain (Ashmand 1822)
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