On This Day In History On This Day In History: Supernova Observed In The Constellation Cassiopeia Was Recorded – On August 4, 1181 MessageToEagle.com | August 4, 2016 MessageToEagle.com – On August 4, 1181, a supernova was seen in the constellation Cassiopeia. Chinese and Japanese astronomers observed this supernova first on August 4 and then on Read More