Aquarius is the eleventh astrological sign in the Zodiac, originating from the constellation Aquarius. In astrology, Aquarius is considered a "masculine", positive (extrovert) sign. It is also considered an air sign and is one of four fixed signs. Aquarius has been traditionally ruled by the planet Saturn, and, since its discovery, Uranus has been considered a modern co-ruler of this sign. Individuals born when the Sun was in this sign are considered Aquarius individuals. Under the tropical zodiac, the Sun is in Aquarius approximately from January 21 to February 19. Under the Sidereal Zodiac, the sun is in the zodiac from February 12 to 14 and leaves between March 8th and 10th, depending on leap year.
Aquarius is sometimes identified with Ganymede, a beautiful youth in Greek mythology with whom Zeus fell in love and, in the disguise of an eagle (represented by the constellation Aquila), carried off to Olympus to be "cup-bearer" to the gods. Aquarius has also been identified as the pourer of the waters that flooded the Earth in the ancient Greek version of the Great Flood myth. As such, the constellation Eridanus the river is sometimes identified as a river being poured by Aquarius.
Aquarius may also, together with the constellation Pegasus, be part of the origin of the myth of the Mares of Diomedes, which forms one of The Twelve Labours of Heracles . Its association with pouring out rivers, and the nearby constellation of Capricornus, may be the source of the myth of the Augean stable, which forms another of the labours.