《Tetrabiblos》The PlanetsClaudius Ptolemy（Ashmand 英譯 1822）
This great man measured the obliquity of the ecliptic, and, though he erroneously reckoned it at only 20½ degrees, it should be recollected that he lived 200 years before the Christian æra.
段落 tetra-2-theplanets-92public-domain (Ashmand 1822)
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