Copernicus or: a rounder rounding

We all know that Nicolaus Copernicus corrected an old error, the belief that the sun revolves aroud the earth. It is much less known that Copernicus' development of his heliocentric was based on another error. This short e-book describes productive errors of Copernicus and his successor Kepler. Derek Miller is an experienced science journalist. He wrote several articles on productive errors in science and history.