1972 Event U.S. orbiting astronomy observatory Copernicus launched 1972 Event Orbiting Astronomical Observatory 4 (Copernicus) launched 1616 Event Copernicus' "de Revolutionibus" placed on Catholic Forbidden index 1543 Death Nicolas Copernicus, astronomer, dies in Poland 1514 Event Copernicus makes his 1st observations of Saturn 1501 Event Copernicus formally installed as canon of Frauenberg Cathedral 1497 Event Nicolaus Copernicus 1st recorded astronomical observation, 1473 Birthday Nicolaus Copernicus, Torun, Poland, astronomer, heliocentrism
