《Tetrabiblos》Knowledge May Be Acquired By Astronomy To A Certain ExtentClaudius Ptolemy（Ashmand 英譯 1822）
In the next place follows the firmament, which is the eighth or starry sphere, and which trembles or vibrates (_trepidat_) in two small circles at the beginning of Aries and Libra (as placed in the ninth sphere); this motion is called by astronomers the motion of the access and recess of the fixed stars.” (Probably in order to account for the procession of the equinoxes.) “This is surrounded by the ninth sphere, called the chrystalline or watery heaven, because no star is discovered in it.
段落 tetra-1-knowledgem-7public-domain (Ashmand 1822)
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