《Tetrabiblos》The Zodiacal PlanisphereClaudius Ptolemy（Ashmand 英譯 1822）
The distance from the cusp of one house to that of the next, taken on the same parallel, is also equal to two temporal hours; thus, for instance, in the latitude above quoted, the semi-diurnal arc of 0° ♊ is 6 h.
段落 tetra-4-thezodiaca-5public-domain (Ashmand 1822)
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