- Polish astronomer who promulgated the now accepted theory that the earth and the other planets move around the sun (the Copernican System ).
- a crater in the second quadrant of the face of the moon, having an extensive ray system: about 56 miles (90 kilometers) in diameter from crest to crest with walls rising about 12,000 feet (3,650 meters) from its floor; having several central mountains the highest being about 2,400 feet (730 meters).
- Nicolaus (ˌnɪkəˈleɪəs). Polish name Mikolaj Kopernik. 1473–1543, Polish astronomer, whose theory of the solar system (the Copernican system) was published in 1543
- a conspicuous crater on the moon, over 4000 metres deep and 90 kilometres in diameter, from which a system of rays emanates
