Algol (Beta Perseus) is at minima at 00:30 UT, 25th April 2014.
The eclipse starts at ~19:44 UT and ends at ~05:20 UT.
Spoiler
The double star Algol consists of a bright white star and a redder dim star; the larger, dim star periodically eclipses the brighter star, causing a dip in brightness. The deaf astronomer John Goodricke realised the reason for this star's irregular brightness in 1782 in York.