Page 154 - 89 history of astronomy_opt

Lectures on Astronomy , the impression is
made that the jointed bars there spoken of
for describing the circles were supposed to
be real. This is no more the case than that
the spheres of Eudoxus and Callippus were
supposed to be real. Both were introduced
only to illustrate the mathematical concep-
tion upon which the solar, planetary, and
lunar tables were constructed. The epicy-
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