Records of eclipses seen roughly 1,500 years ago have shown how Earth's rotation has changed over time.
Researchers looked through Byzantine Empire archives.
after the collapse of the Western Roman Empire, the Roman Empire's eastern half remained in existence.
five total solar eclipses that occurred across the Eastern Mediterranean between the fourth and seventh century A.D. were recognised.
identifying their likely times and places. There were few reports of this solar eclipse in the past.
Because eclipses can reveal information about the motion of our planet,
These kinds of records can be useful resources for comprehending how the Earth's rotation has varied over time.