sentences:  There is a possibility that Regiomontanus already arrived at a theory of heliocentrism before his death in 1476, as he paid particular attention to the heliocentric theory of Aristarchus in a late work, and mentions the "motion of the Earth" in a letter.Copernicus' major work, "De revolutionibus orbium coelestium" - "On the Revolutions of the Heavenly Spheres" (first edition 1543 in Nuremberg, second edition 1566 in Basel), was a compendium of six books published during the year of his death, though he had arrived at his theory several decades earlier.The work marks the beginning of the shift away from a geocentric (and anthropocentric) universe with the Earth at its center.