The Minima of Algol
http://skytonight.com/observing/objects/variablestars/3304096.html?page=1&c=yAn article by Alan MacRobert from Sky and Telescope Magazine about the star Algol (Beta Persei) was the first eclipsing variable star ever discovered.
Submitted in section: Astronomy: Stars: Variable Stars: The Minima of Algol