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It lays out the heliocentric theory, which suggests that the Earth revolves around the Sun. Copernicus' book revolutionized the field of astronomy and challenged the geocentric theory that had been predominant since the time of ancient Greece. In De revolutionibus orbium coelestium, he presents his argument for the heliocentric model, using mathematical calculations and observations to support his claims. Although published in 1543, Copernicus had actually completed the manuscript several years earlier, but delayed its publication due to concerns about the controversial nature of his ideas. The book is divided into six parts and presents a detailed description of the motion of celestial bodies, including the Earth, the Moon, the Sun, and the planets. De revolutionibus orbium coelestium is considered a landmark in the Scientific Revolution and is often seen as the starting point of modern astronomy. It challenged the long-held beliefs of the Catholic Church, as well as the established scientific and philosophical theories of the time. While initially met with resistance, Copernicus' work eventually gained acceptance and fundamentally changed the way people understood the universe. His heliocentric model laid the groundwork for future scientific advancements and paved the way for subsequent astronomers, such as Johannes Kepler and Galileo Galilei. Today, De revolutionibus orbium coelestium is recognized as one of the most important scientific works in history and a major contribution to our understanding of the cosmos. It continues to be studied and celebrated for its profound impact on astronomy and the scientific method.