《Tetrabiblos》Knowledge May Be Acquired By Astronomy To A Certain ExtentClaudius Ptolemy（Ashmand 英譯 1822）
For an entire return of all the heavenly bodies to the exact situation in which they have once stood with regard to the earth will never take place, or at least not in any period determinable by human calculation, whatever vain attempts may be made to acquire such unattainable knowledge.[22] The examples referred to for guidance being therefore not exactly similar to the existing cases to which they are now applied, it must naturally follow that predictions are sometimes not borne out by the events.
段落 tetra-1-knowledgem-38public-domain (Ashmand 1822)
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