📅 21 September 1988
Researchers compared thousands of dated observations with modern orbital calculations to study long-term changes in Earth's rotation.
📅 21 September 1988
A mismatch between predicted and recorded eclipse paths reveals accumulated changes in the length of the day.
📅 21 September 1988
Records reaching back many centuries give modern science a time span impossible to reproduce with recent instruments alone.
📅 21 September 1988
Chinese textual expertise and modern celestial mechanics together create evidence neither discipline could produce independently.
