The third variable star, Chi Cygni, was observed in 1686 and in 1704. Over the next 80 years seven more variable stars were identified.

New kind of variable star discovered: Minute variations in brightness reveal whole new class of stars Date: June 12, 2013 Source: ESO Summary: Astronomers have found a new type of variable star ...

IT had long been known that certain stars greatly varied in brightness and some observations had been made concerning them, but it was reserved to the Herschels to Dave the way for practical ...

Letter Published: 25 April 1889 Variable Stars and the Constitution of the Sun A. FOWLER Nature 39, 606 (1889) Cite this article ...

Hubble had already used this knowledge in his 1924 discovery that the Andromeda nebula, containing a variable star, was more than 900,000 light years from Earth -- way beyond our own galaxy -- a ...