https://www.livescience.com/20575-ancient-egyptian-calendar-demon-star.html
Ancient Egyptian Calendar Reveals Earliest Record of 'Demon Star' | Live Science
May 31, 2012 - The Cairo Calendar from ancient Egypt may be the earliest record of a variable star, the dimming of the so-called Demon Star, astronomers now say.
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https://www.sciencenews.org/archive/demon-star-may-be-quadruplets-not-triplets
Demon Star May Be Quadruplets, Not Triplets | Science News
demon starmay bequadrupletstripletsscience
https://www.sciencealert.com/ancient-egyptian-papyrus-contains-earliest-record-of-incredible-star
Ancient Egyptian Papyrus Contains Earliest Record of 'Demon Star' : ScienceAlert
Jan 1, 2016 - Scientists studying a 3,200 year-old papyrus document from ancient Egypt think they've found the earliest record of the variable star Algol - a three-star...
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