De revolutionibus orbium coelestium has 405 pages.
A:Copernicus' book, De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres), was placed on the Index of Forbidden Books by a decree of the Sacred Congregation of March 5, 1616:This Holy Congregation has also learned about the spreading and acceptance by many of the false Pythagorean doctrine, altogether contrary to the Holy Scripture, that the earth moves and the sun is motionless, which is also taught by Nicholaus Copernicus' De revolutionibus orbium coelestium and by Diego de Zúñiga's In Job ... Therefore, in order that this opinion may not creep any further to the prejudice of Catholic truth, the Congregation has decided that the books by Nicolaus Copernicus [De revolutionibus] and Diego de Zúñiga [In Job] be suspended until corrected.
There is no exact date that can be known, some like to mark its beginning with the birth, in 1473, of Nicolaus Copernicus, or with the publication of his work, in 1543, De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres), declaring a solar system with the Sun at its center. Most will agree that it was a force in science by the end of the 18th century and many would argue that it is still going on. This revolution was driven, not by one, but by many, new ideas. This is why it is impossible to date. However, somewhere between Copernicus' birth and his revolutionary paper, it must had to have started.
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