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the earth about its axis, in the opposite di-
rection to the apparent motion of the stars.
Also in the writings of Martianus Capella
he learnt that the Egyptians had supposed
Mercury and Venus to revolve round the
sun, and to be carried with him in his an-
nual motion round the earth. He noticed
that the same supposition, if extended to
Mars, Jupiter, and Saturn, would explain
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