The Ptolemaic system of the universe, with the earth at the center, had held sway since antiquity as authoritative in philosophy, science, and church teaching. Following his observations of the heavenly bodies, Nicolaus Copernicus (1473-1543) abandoned the geocentric system for a heliocentric model, with the sun at the center. His remarkable work, On the Revolutions of Heavenly Spheres, stands as one of the greatest intellectual revolutions of all...

Galileo's outstanding scientific work supporting the new Copernican conception of the universe (which led to the famous trial). In the form of a conversation among characters named Salviati, Sagredo, & Simplicio.

Publisher's description: In the spring of 1543 as the celebrated astronomer, Nicolaus Copernicus, lay on his death bed, his fellow clerics brought him a long-awaited package: the final printed pages of the book he had worked on for many years: De revolutionibus (On the Revolutions of the Heavenly Spheres). Though Copernicus would not live to hear of its extraordinary impact, his book, which first suggested that the Sun, not the Earth, was the center...