Mind-Benders of Mesopotamian History
Babylon kept a nightly sky log for roughly six centuries
For about 600 years, Babylonian scholars maintained the Astronomical Diaries, night-by-night records of the Moon, planets, weather, river levels, and market prices. It is often called the longest continuous observational research program in human history.
How we know
The Babylonian Astronomical Diaries run from c. 652 BCE to c. 61 BCE (~590 years), preserved on several hundred cuneiform tablets, most now in the British Museum; published by Sachs and Hunger, 'Astronomical Diaries and Related Texts from Babylonia.'
One of many fact-checked wonders across eight traditions at The Spring of Wisdom.