Kepler's first law worked, where Copernicus' original heliocentric model failed, because Kepler described the orbits as

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Kepler's first law states that planets orbit the sun in elliptical paths, not circular ones. This was a significant improvement over Copernicus' model, which assumed circular orbits and could not accurately account for the observed planetary motions without additional complex mechanisms like epicycles. By adopting elliptical orbits, Kepler's model provided a simpler and more accurate description of planetary motions.

Kepler's First Law Worked, Where Copernicus' Original Heliocentric Model Failed