What constellation is behind the Aquarius?

According to the perpetual calendar, Pisces is behind the water bottle. The date of birth of Pisces is 19 from February to March 20th. In ancient times, the rise and fall of stars or constellations were often used to navigate and determine time. Ancient Egypt determined the beginning of a year by observing the rise of Sirius: in some areas, the ancient technology of determining the position by observing the stars still remains. Constellations and the literary images they represent often appear in the works of literati.