On the Revolutions of the Celestial Spheres

This seminal work by Nicolaus Copernicus presents a heliocentric model of the universe, where the Earth and other planets revolve around the Sun. Published in 1543, it marked a significant shift from the Ptolemaic geocentric system and influenced later scientists such as Galileo and Isaac Newton.

The book is divided into six sections, detailing Copernicus' cosmology, the motions of celestial bodies, and mathematical proofs to support his theory.

Despite retaining some elements of ancient astronomy, such as the use of epicycles, Copernicus' work was a crucial step in the development of modern astronomy and the Scientific Revolution.