《Tetrabiblos》The Zodiacal PlanisphereClaudius Ptolemy（Ashmand 英譯 1822）
99. Fig. 1 is the Planisphere adjusted for the northern latitude of 30° 22′ (where the longest day consists of fourteen equatorial hours), agreeably to the “Exemplification” given by Ptolemy in Chapter XV, Book 3.
段落 tetra-4-thezodiaca-2public-domain (Ashmand 1822)
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