the Sun In Pisces (Pisceans) (FEB. 19-MARCH 20) February 19, 1473 -  Nicolaus Copernicus - was the first astronomer to formulate a scientifically based heliocentric cosmology that displaced the Earth from the center of the universe. His epochal book, De revolutionibus orbium coelestium ( On the Revolutions of the Celestial Spheres