Nicolaus Copernicus.

Dziś urodziny naszego wielkiego astronoma.
Copernicus was a Polish astronomer, best known for his theory that the Sun and not the Earth is at the centre of the universe.
Nicolaus Copernicus was born on 19 February 1473 in Thorn (modern day Torun) in Poland. His father was a merchant and local official. When Copernicus was 10 his father died, and his uncle, a priest, ensured that Copernicus received a good education. In 1491, he went to Krakow Academy, now the Jagiellonian University, and in 1496 travelled to Italy to study law. While a student at the University of Bologna he stayed with a mathematics professor, Domenico Maria de Novara, who encouraged Copernicus' interests in geography and astronomy....
Read more:
http://www.bbc.co.uk/history/historic_figures/copernicus.shtml

or watch:

Copernicus - 100 Greatest Discoveries  https://www.youtube.com/watch?v=GPBB5thPgQE

Copernicus Biography   https://www.youtube.com/watch?v=5HlJLrpL2-I