Posted on July 10, 2026, 11:20 pm By professorrosado
Research More At iKnowdle!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 may have said the same. But there’s a problem. For it to be one of the 13 brightest, it had to be much more luminous than it is today.
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