AQUARIUS (the Water-bearer or Cup-bearer), in astronomy, the eleventh sign of the zodiac, situated between Capricornus and Pisces. Its symbol is representing part of a stream of water, probably in allusion to the fact that when the sun is in this part of the heavens (January, February), the weather is rainy. The constellation, though large, has no striking features, the brightest stars being of the third magnitude.