ABSTRACT
A variable star discovered in 1784 by John Goodricke (1764–86), a young deaf-mute astronomer from York who two years previously had explained the variability of Algol. The first discovered of an important class of variable stars which are now known as Cepheid variables, δ Cephei and other Cepheids of relatively long period now form the subclass `classical Cepheids'
