Why was Nicolaus Copernicus's theory that the Earth orbits the sun so shocking?

Nicolaus Copernicus's heliocentric theory was shocking because it challenged the long-held geocentric view, which posited that the Earth was the center of the universe. This belief was deeply rooted in both Aristotelian philosophy and the teachings of the Church, making the idea that the Earth was just one of several planets orbiting the sun fundamentally revolutionary. Additionally, it undermined humanity's perceived centrality in the cosmos, prompting significant philosophical and religious debates. The radical shift in perspective marked a pivotal moment in the Scientific Revolution.