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Ancient Egyptians Tracked Eclipsing Binary Star Algol

Discovery News (Jennifer Ouellette) Turn your telescope to the constellation of Perseus and you might note an unusual star called Algol, dubbed the "Demon Star" or the "Raging One." You wouldn't notice anything much different at first, unless you happened to be looking during a window of a few hours -- every 2.867 days -- when Algol's brightness visibly dims.This unusual feature was first noticed back in 1667 by an astronomer named Geminiano Montanari, and later confirmed -- with a proposed possible mechanism -- in 1783 by John Goodricke, who precisely measured the period of variability: it dims every 2.
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