Today in the Middle Ages: June 6, 1178

On June 6, 1178, a group of monks in Canterbury reported seeing "two hours of light" on the shadowed part of the moon.

The observation occurred during the Taurid meteor shower, and the most likely scientific explanation is that the moon was struck by a meteor. The young lunar crater Giordano Bruno, 22 km, is in the right location to have been formed by this impact, but its origin is not considered certain.