Ancient Chinese Eclipse Reanalysis Refines 2,700‑Year‑Old Earth Rotation Rate

A team of astronomers and historians has corrected an eight‑kilometre misplacement of the ancient Chinese capital of Luoyang, enabling a precise reconstruction of the total solar eclipse that struck the region in 709 BCE. By aligning the eclipse’s path with the corrected site, researchers derived a more accurate estimate of Earth’s rotation speed at that time. The analysis shows that the planet was spinning slightly faster than previously thought, narrowing the margin of error in long‑term models of Earth’s rotational deceleration. The study also refines the chronology of ancient Chinese astronomical records, linking them more reliably to modern celestial mechanics. These findings provide a firmer baseline for scientists studying the interplay between Earth’s rotation, climate change, and tectonic processes over millennia.