On the Revolutions of the Heavenly Spheres – Nicolaus Copernicus

"Finally we shall place the Sun himself at the center of the Universe."

Nicolaus Copernicus proposes a heliocentric model of the universe, placing the Sun, rather than the Earth, at the center. He argues that the Earth rotates on its axis and orbits the Sun, offering a simpler and more accurate explanation for the movements of the planets than the ancient Ptolemaic system.

Published just before his death in 1543, this book triggered the Copernican Revolution. It fundamentally altered humanity's perception of its place in the cosmos, challenging centuries of scientific and religious dogma and paving the way for Galileo and Kepler.