Polish canon, professor of mathematics, doctor and astronomer. A student of the Italian astronomer, Domenico Maria Novara (Bologna 1496-1500).
Developed heliocentrism, a new theory on the movement of the planets opposing Ptolemy's geocentrism. Heliocentrism considers that the planets, including the Earth, circle the Sun whereas geocentrism made the Earth the centre of the universe around which the Sun and planets revolved.
First unsigned treatise on astronomy (now known under the title “Commentaliorus”). Copernicus set out the principles of heliocentrism.
Completed his major work, "De revolutionibus".
Publication, a little before Copernicus' death, of "De revolutionibus" by a Nuremberg printer.