Mathematician and astronomer Nicolaus Copernicus was born #OTD in 1473.
The publication of Copernicus's model in his book De revolutionibus orbium coelestium, just before his death in 1543, was a major event in the history of science, triggering the Copernican Revolution and making a pioneering contribution to the Scientific Revolution. via @wikipedia
Books by Nicolaus Copernicus at PG:
https://www.gutenberg.org/ebooks/author/6426