《Tetrabiblos》Signs InconjunctClaudius Ptolemy(Ashmand 英譯 1822)
108 and 135 degrees, are not subtended by the sides of any ordinate figure_.” †Except the semiquadrate, which he has not at all noticed.
段落 tetra-1-signsincon-11public-domain (Ashmand 1822)
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