As the Earth spins around once every 24 hours, Cassiopeia makes a giant circle around the North Star, going one twenty-fourth of the way around each hour. If you compare it at the same time during each season, it goes one quarter of the way around each season. It's name is the Geminids. The Geminids is an exception. Due to the angle from which this shower hits the Earth, this shower is best seen before midnight.
Variable stars change their brightness over a period of time.
Algol gets dimmer approximately once every 2 days and 20 hours. It stays near its dimmest for about 2 hours, with the entire fading and brightening process lasting about 7 hours. Algol is best seen beginning in autumn and into early winter. It is found in the northern constellation Perseus. See diagram below for graphical representation of Algol's position relative to Cassiopeia.