He worked on his theory for years, but it was only published in the year of his death, in 1543.
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Copernicus' theory was that Earth is not the center of the universe and we revolve around the Sun.
He was a Polish mathematician who disagreed with Ptolemy's view that the earth is the center of the universe. The heliocentric theory is the theory that the sun is the center of the universe, not the earth.
Nicolaus Copernicus
that the world was heliocentric not geocentric aka sun centered universe and earth centered universe
Copernicus thought that is was heliocentric theory ( that the earth revolves around the sun) and Brahe thought that it was geocentric ( that everything revolves aroung the earth )