The Copernican model was controversial for several reasons, and the three most pertinent ones would be:
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It contradicted religious doctrine of the time: The geocentric model, which placed Earth at the center of the universe, was deeply intertwined with the religious beliefs of the time, particularly within Christianity. The Copernican model challenged this view, suggesting that the Earth was not the center of the universe, which was seen as a threat to the established religious order.
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It contradicted established scientific understanding: The prevailing scientific paradigm was based on the Ptolemaic system, which had been accepted for centuries. The Copernican model proposed significant changes to this understanding, which created resistance among scholars who were accustomed to the existing geocentric model.
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It demoted Earth to just another planet: By placing the Sun at the center and positioning Earth as one of the planets orbiting it, the Copernican model fundamentally altered humanity's perception of its place in the universe. This demotion was not only controversial from a scientific perspective but also had philosophical and existential implications, leading to significant resistance from various quarters.
These aspects combined made the Copernican model a radical shift, facing significant opposition from both scientific and religious institutions of the time.