Image created using Starry Night software.

Tonight at 8pm you can find the constellation Perseus high in the eastern sky. There is a star in Perseus called Algol that is fun to watch over a period of roughly three days. Visible to the unaided eye, Algol will drop from 2.1 to 3.4 magnitude every 2.87 days. This occurs because Algol is two stars that orbit and eclipse one another.