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of an old Egyptian theory, mathematically
identical with that of Copernicus, but not
involving a stellar parallax. He says ( De
Mundi , etc.) that
the Ptolemean system was too compli-
cated, and the new one which that great
man Copernicus had proposed, following in
the footsteps of Aristarchus of Samos, though
there was nothing in it contrary to mathe-
182