What did copernicus descover?

What did copernicus descover ?

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It was Copernicus that first said that the Earth was a planet orbiting the Sun. He also said that all planets moved in circles, one inside the other.
jon.ellis
05 May 2011
This is a good article you should read http://www.phy6.org/stargaze/Ssolsys.htm
jon.ellis
05 May 2011
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