《Tetrabiblos》The New Moon Of The YearClaudius Ptolemy（Ashmand 英譯 1822）
And to obviate any doubt as to which of these four points should preferably be considered as the primary beginning (since in the regular simple motion of a circle no part of it has any apparent precedence), the appropriate quality naturally belonging to each of these four points has been taken into consideration by the writers on this subject.
段落 tetra-2-thenewmoon-2public-domain (Ashmand 1822)
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