《Tetrabiblos》The New Moon Of The YearClaudius Ptolemy（Ashmand 英譯 1822）
After the vernal equinox comes the summer solstice; when the day attains its greatest length, and in Ægypt, at the same period, the rise of the Nile takes place and the Dog Star appears.
段落 tetra-2-thenewmoon-4public-domain (Ashmand 1822)
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