Johannes Kepler wrote several books in his lifetime. Some of his books are Epitome of Copernican Astronomy and Harmonies of the World, Selections from Kepler's Astronomia Nova, and The Six-Cornered Snowflake.
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Nothing. Copernicus died years before Kepler was born.
euclids elements
Kepler showed that planetary orbits were actually ellipses, not circles as proposed by Copernicus.
The Elements which are 13 volumes
The only part of Copernicus's theory that Kepler retained was the idea that the Sun is at the centre of the Solar System.