Scientists eventually accepted Copernicus's theory of planetary motion over Ptolemy's because the former was simpler.

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Copernicus's heliocentric model, which placed the Sun at the center of the solar system, offered a simpler and more elegant explanation for the observed motions of celestial bodies than Ptolemy's geocentric model, which required complex mechanisms like epicycles to explain planetary movements. This adherence to the principle of simplicity, or Occam's Razor, was a key reason for the eventual acceptance of Copernicus's theory.

Scientists Eventually Accepted Copernicus's Theory of Planetary Motion Over Ptolemy's