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orbit is a circle same as with others orbits
Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 13th, 2015
the reason that the orbit of Mars was particularly difficult was
that Copernicus had correctly placed the Sun at the center of the Solar System,
but had erred in assuming the orbits of the planets to be circles.
Thus, in the Copernican theory epicycles were still required to explain the
details of planetary motion.