June 19

Eratosthenes
June 19 240 BC Eratosthenes estimates the circumference of Earth using two sticks.
325 - Bishop Hosius, a delegate at the Council of Nicea, announces the newly written Nicene Creed countering the Arian Heresy, according to Christianity Today.
This Day in Ancient History

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Ancient Rome and Ancient Greece

On the inaccuracy of This Day in Ancient History