How did Kepler disagree with the theorys of Copernicus?

Answer 1

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Answer 2

Johannes Kepler found out that planets move in ellipses and move at variable speeds as they travel round the sun. The former theory of Copernicus was not wrong, but Kepler's theory was found to be more accurate when accurate observational methods were developed.

Later Kepler's theory was backed up by theory when Newton's law of gravitation came along. However in the 20th century Einstein's theory of relativity produced some small corrections to the Kepler/Newton theory.

Answer 3

Kepler assumed that planetary orbits were eliptical, but only after he found that doing so was the only way to match observation with theory. Nicolae Copernicus, and later Galileo Galilei, could not imagine these orbits being anything but circular.

Answer 4

Kepler used the idea of placing the Sun at the centre instead of the Earth. In that respect he upheld the Copernican idea. However Kepler's model threw out all the other aspects of earlier systems in favour of elliptical orbits for the planets.

Answer 5

By completely replacing all the old circles and epicycles of Ptolemy and Copernicus and deciding to try elliptical orbits instead, which fitted the latest and most accurate observations of Tycho Brahe more closely than the other models.

All Kepler retained from Copernicus's theory was the idea of having the Sun at the centre.