Copernicus was a polish astronomer that first formed the theory that the Earth was at the center of the universe.
Copernicus was the first to propose that the Earth was NOT the center of the solar system but the Sun was, and the Earth and plantes rotated around it. This idea was in direct opposition to prevailing beliefs at the time.
The publication of Copernicus's book, "De Revolutionibus Orbium Coelestium," was important because it presented the heliocentric model of the universe, placing the Sun at the center with planets orbiting around it. This challenged the geocentric view that had prevailed for centuries and laid the foundation for modern astronomy and our understanding of the universe. Copernicus's work revolutionized our understanding of the cosmos and paved the way for later scientific advancements.