《Tetrabiblos》The TriplicitiesClaudius Ptolemy（Ashmand 英譯 1822）
The familiarity existing by triplicity arises in the following mode: The triplicity preserves accordance with an equilateral triangle, and the whole zodiacal orbit is defined by three circles, viz.
段落 tetra-1-thetriplic-1public-domain (Ashmand 1822)
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