Before Copernicus, the Christian worldview held that the Earth and God's creation were the center of the world. But in the calendar of the time, dates and seasons diverged. The Pope demanded a reform of the calendar. The astronomer and scientist Nicolaus Copernicus was also given the task. But Copernicus had long since discovered something innovative and revolutionary. Although this discovery made it possible to rectify the calendar, it also plunged pious Christianity into a serious conflict: the Earth revolved around the Sun. A dangerous thought.