*Copernicus' epochal book, De revolutionibus orbium coelestium (On
the Revolutions of the Celestial Spheres), published just before his
death in 1543, is often regarded as the starting point of modern astronomy and the defining epiphany that began the scientific revolution. His
heliocentric model, with the Sun at the center of the universe, demonstrated that the observed motions of celestial objects can be explained
without putting Earth at rest in the center of the universe. His work stimulated further scientific investigations, becoming a landmark in the history of science that is often referred to as the Copernican Revolution.
*Nicolaus Copernicus (German: Nikolaus Kopernikus; Italian: Nicolò
Copernico; Polish: Mikołaj Kopernik; in his youth, Niclas Koppernigk;[1]
19 February 1473 – 24 May 1543) was a Renaissance astronomer and
the first person to formulate a comprehensive heliocentric cosmology
which displaced the Earth from the center of the universe.[2]
*"Revolution is never practical - until the hour of revolution strikes.
Then it alone is practical, and all the efforts of the conservatives and
compromisers become the most visionary and futile of human imaginings. For that hour let us work, think and hope. For that hour let us
pawn our present ease in hopes of a glorious redemption: For that hour
let us prepare the hosts of labour with intelligence sufficient to laugh at
the nostrums dubbed practical by our slave-lords - practical for the perpetuation of our slavery: For the supreme crisis of h [X[