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the ecliptic, making one revolution and a
twenty-six thousandth part of a revolution
in the sidereal year, in the opposite direc-
tion to its orbital motion.
In view of this fanciful structure it must
be noted, in fairness to Copernicus, that
he repeatedly states that the reader is not
obliged to accept his system as showing the
real motions; that it does not matter whether
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