Aquarius is, no doubt, one of the oldest constellations to be traced in the night sky. It was a very important part of the culture and imagination of the Sumerian People. It is located south of Pegasus and Pisces. In Babylonian times, this constellation represented a man, probably the God Enki, which poured water into the mouth of the Piscis Australis. An ancient constellation, Piscis Austrinus represents the Babylonian fish-god Oannes, who came to Earth to teach humans how to become civilized. Piscis Austrinus was one of the 48 constellations listed by the 2nd century astronomer Ptolemy and it remains one of the 88 modern constellations.
In Greek mythology, this constellation is known as the Great Fish and it is portrayed as swallowing the water being poured out by Aquarius, the water-bearer constellation. In this myth, there is a reference to the Great Deluge which supposedly happened upon Earth. This is the Great Deluge also portrayed in the Bible in the story of Noah. In the Greek myth, the Human character is the Waterer that had an amphora from where the water from the flood poured forth. It was because of Fomalhaut, the Fish’s mouth, that the world was saved, because the Fish drank all of the waters, thus preventing the world to be engulfed in the deluge.
The two fish of the constellation Pisces are said to be the offspring of the Great Fish. In Egyptian mythology, this fish saved the life of the Egyptian goddess Isis, so she placed this fish and its descendants into the heavens as constellations of stars. The Southern Fish was sacred to the Egyptians, who imagined the infamous Nile fish had swallowed the phallus of the dismembered Osiris.