1268: we thought nobody saw it, but Korea did, and it is already published

We had said the biggest 13th-century radiocarbon candidate had no sky witnesses, because the Yau 1995 catalogue has no East Asian aurora from 1264 to 1276. Miyahara et al. 2022 cite a Korean record of 15 February 1269 (from Abbott and Juhl 2016): a white band about 3 degrees wide across the night sky. They pair it with the 1268 to 1269 jump, and the timing fits their tree. So the puzzle was a gap in our catalogue, not in the sky. Lesson: one catalogue is never the whole record.

And a second witness: reading the Goryeosa ourselves we found a red vapour in the west on 19 December 1268, inside the timing window and a stronger kind of glow than the February 1269 band. Miyahara's paper does not cite it, so it may be worth telling them.