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Nicolaus Copernicus (/koʊˈpɜrnɪkəs, kə-/; Polish:  Mikołaj Kopernik ; German: Nikolaus Kopernikus; 19 February 1473 – 24 May 1543) was a Renaissance mathematician and astronomer who formulated a model of the universe that placed the Sun rather than the Earth at its center. The publication of this model in his book De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres) just before his death in 1543 is considered a major event in the history of science, triggering the Copernican Revolution and making an important contribution to the Scientific Revolution.

Copernicus was born and died in Royal Prussia, a region that had been a part of the Kingdom of Poland since 1466. He was a polyglot and polymath, obtaining a doctorate in canon law and also practising as a physician, classics scholar, translator, governor, diplomat and economist. In 1517, he derived a quantity theory of money – a key concept in economics – and, in 1519, formulated a version of what later became known as Gresham's law.