Did you know...
... that today is Supernova Discovery Day? In 1181, a
supernova was first observed by Japanese and Chinese astronomers. The astronomers recorded the supernova, now known as SN 1181, in eight separate texts. One of only eight
supernovae in the Milky Way observable with the naked eye in
recorded history, it appeared in the constellation Cassiopeia
and was visible in the night sky for about 185 days.