The 8-cent Nicolaus Copernicus commemorative stamp was first placed on sale at Washington, DC, on April 23, 1973.
Nicolaus Copernicus (1473-1543) was a revolutionary astronomer whose work produced the "Heliocentric Model." Copernicus was the first astronomer to argue that the earth was not the center of the universe. He claimed that the sun is the center. Copernicus' argument that the earth rotated around the sun inextricably altered the way in which the world viewed its place in the universe.
The stamp was designed by Alvin Eisenman and was issued in sheets of fifty, with an initial printing of 150 million.
Postal Bulletin (March 15, 1973).