Nicolaus Copernicus was born in 1473 in Toruń, in what is now Poland. He was born on Wednesday, February 19, 1473. Trained in law, medicine, mathematics, and astronomy, he spent most of his life working as a church canon—an administrator, not a professional scientist. Astronomy was his private passion, pursued quietly alongside his official duties.

Over decades, Copernicus wrestled with a problem inherited from antiquity: the messy complexity of planetary motion in the Earth-centered universe. The more he worked, the clearer it became that placing the Sun at the center simplified everything. Yet he hesitated. Publishing such an idea challenged centuries of accepted thought, and Copernicus was cautious by nature.

Near the end of his life, encouraged by younger scholars, he finally allowed his work to be published. De revolutionibus orbium coelestium appeared in 1543—the year of his death. He died on Monday, May 24, 1543 in Frombork, a cathedral town in Warmia, Poland, where he had lived and worked for many years as a church canon. Copernicus never witnessed the storm his idea would unleash, but his quiet insistence on mathematical coherence reshaped how humanity understands its place in the cosmos.