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little distance from the sun, that the epicy-
cles have centres at a little distance from
the deferent, and so on). He says that, after
using all these devices to make theory agree
with Tycho’s observations, he still found er-
rors amounting to eight minutes of a degree.
Then he said boldly that it was impossible
that so good an observer as Tycho could
have made a mistake of eight minutes, and
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