1473 AD – He was born on the 19th day of February in the city of ToruD (Thorn) in Royal Prussia.
1491 AD – He enrolled at the Kraków Academy (now Jagiellonian University), where he probably first encountered astronomy with the professor, Albert Brudzewski.
1495 AD – He went to Italy, where he studied law and medicine at the universities of Bologna and Padua.
1497 AD – His uncle was ordained Bishop of Warmia, and Copernicus was named a canon at Frombork Cathedral, but he waited in Italy for the great Jubilee of 1500.
1501 AD – He would thus have visited Frombork only in this year. As soon as he arrived, he requested and obtained permission to return to Italy to complete his studies at Padua and at Ferrara.
1503 AD – He received his doctorate in canon law.
1504 AD – He began collecting observations and ideas pertinent to his theory.
1519 AD – He formulated an early iteration of the theory, now called "Gresham’s Law," that "bad" (debased) coinage drives "good" (un-debased) coinage out of circulation.
1514 AD – He made available to friends his Commentariolus (Little Commentary) — a short handwritten text describing his ideas about the heliocentric hypothesis. Thereafter he continued gathering data for a more detailed work.
1536 AD – His work was nearing its definitive form, and rumors about his theory had reached educated people all over Europe.
1539 AD – He was still working on De revolutionibus orbium coelestium (even if not convinced that he wanted to publish it).
1543 AD – He died on the 24th day of May in Frombork, Poland.