In the year 1054, a star 7,000 light years away exploded and became the first supernova to be so clearly visible from Earth and from such a close distance. The supernova was so visible that Chinese records described it as six times brighter than Venus and as brilliant as a full moon. They called it a Guest Star and was visible in their sky for eight months. Some astronomers associate the Chinese Guest Star with what we now call Crab Nebula.
Imagine that. Eight months with two moons.