Original: De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres) is the seminal work on the heliocentric theory of the Renaissance astronomer Nicolaus Copernicus (1473 â "1543).
Simplified: De revolutionibus orbium coelestium (On the revolutions of the heavenly spheres) is great work of the Renaissance astronomer Nicolaus Copernicus (1473 â "1543).