By Charles W. Bachman
Communications of the ACM,
November 1973,
Vol. 16 No. 11, Pages 653-658
10.1145/355611.362534
Comments
This year the whole world celebrates the five-hundredth birthday of Nicolaus Copernicus, the famous Polish astronomer and mathematician. In 1543, Copernicus published his book, Concerning the Revolutions of Celestial Spheres, which described a new theory about the relative physical movements of the earth, the planets, and the sun. It was in direct contradiction with the earth-centered theories which had been established by Ptolemy 1400 years earlier.
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