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nicus: The earth moves in an epicycle, on
a deferent whose centre is a little distance
from the sun. The planets move in a sim-
ilar way on epicycles, but their deferents
have no geometrical or physical relation to
the sun. The moon moves on an epicy-
cle centred on a second epicycle, itself cen-
tred on a deferent, excentric to the earth.
The earth’s axis rotates about the pole of
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