Chinese observers record the Double-Dawn eclipse

Court observers linked celestial monitoring with calendars, ritual and government, creating records later useful to historians and astronomers.

Reconstructed eclipse paths allow researchers to compare the annal with the expected visibility from ancient Zheng.

When an ancient observation has a secure place and date, its timing can constrain how Earth's rotation has slowed over millennia.

The Bur-Sagale eclipse was entered in the Assyrian eponym lists and is securely identified with 15 June 763 BCE.

The astronomical identification provides a fixed date for rulers and events recorded in Assyrian year-name lists.