The term 'Celestial Lion' is a reference to the constellation of LEO, which is represented by a lion in the night sky. LEO is one of the oldest known constellations, having been identified by ancient Babylonian astronomers in the 2nd millennium BC. It is located in the northern sky and is visible throughout the year in the Northern Hemisphere. The constellation is made up of nine stars and is associated with the mythological figure of the Nemean Lion, a beast that was slain by Hercules.