On  November 6, 1572, the German astronomer Wolfgang Schüler of Wittenberg observed the appearance of a new star in the Cassiopeia constellation. The brilliant light source was adjacent to the paler  star at the center of the "W" or "M" depending on the season. In Europe, other observers will also notice the spectacular phenomenon. It was even possible to observe it during the day. In fact, Wolfgang Schüler and other astronomers witnessed the explosion of a star. This phenomenon is called supernova and it  is very bright. However, the supernova will not be named Wolfgang Schüler. Instead, the history  will retain the name of Tycho Brahe.