The Carrington Event struck on September 1, 1859, when a coronal mass ejection erupted from the Sun and struck Earth. The resulting geomagnetic storm set off a vast display of the Aurora Borealis, the Northern Lights, on September 2 that was seen as far south as Cuba and Hawaii. Those low latitudes suggest it should have been seen in Mexico as well, but little has been known about what people saw there – until now.