phys.org

To ancient astronomers, Theta Eridani was brighter for 1,000 years—now we know why

There's a bit of a historical mystery surrounding the star Theta Eridani. Ptolemy in the second century A.D. and al-Sufi in A.D. 964 both recorded Theta Eridani as one of the 13 brightest stars in the sky. Hipparchus ma…

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