Source : Webster's Revised Unabridged Dictionary (1913)

Copernican \Co*per"ni*can\, a.
   Pertaining to Copernicus, a Prussian by birth (b. 1473, d.
   1543), who taught the world the solar system now received,
   called the Copernican system.

Source : WordNet®

Copernican
     adj 1: of radical or major importance; "a Copernican revolution in
            modern art"
     2: according to Copernicus; "in the Copernican system the earth
        and other planets revolve around the sun"