Who pioneered the revolution in the study of astronomyy in the 16th century?

The revolution in the study of astronomy in the 16th century was pioneered by Nicolaus Copernicus. He proposed the heliocentric model, which posited that the Earth and other planets revolve around the Sun, challenging the prevailing geocentric view that placed the Earth at the center of the universe. Copernicus's work laid the foundation for modern astronomy and significantly influenced later astronomers like Galileo and Kepler. His ideas marked a crucial shift in scientific thought during the Renaissance.