Question

what is the theory of Nicholas Copernicus

Answer 1

that earth revolves around sun rather than other planets revolve around earth

Answer 2

Copernician heliocentrism is the name given to the model developed by Copernicus and published in 1543..
This model places Sun at the centre of the universe, motionless with Earth and other planets revolving around the Sun.
This model departed from Ptolemaic geocentric model which placed Earth at the centre of the universe...

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