"De revolutionibus orbium coelestium," written by Nicolaus Copernicus, is a groundbreaking work that introduced the heliocentric model of the universe. Published in 1543, it proposed that the Earth and other planets revolve around the Sun, challenging the long-held geocentric view that placed the Earth at the center. This shift in perspective laid the foundation for modern astronomy. The book is divided into six sections, detailing the movements of celestial bodies and providing mathematical explanations for their orbits. Copernicus's ideas sparked a scientific revolution, influencing later astronomers like Galileo Galilei and Johannes Kepler, and ultimately changing our understanding of the cosmos.