Ganymede was afterwards regarded as the genius of the fountains of the Nile, the life-giving and fertilizing river, and identified by astronomers with the Aquarius of the zodiac. Thus the divinity that distributed drink to the gods in heaven became the genius who presided over the due supply of water on earth.
Halley's comet conforms very well, however, with a meteoric shower directed from Aquarius early in May.
A close analogy with the Mexican calendar sign Cipactli, a kind of marine monster resembling a narwhal s Aquarius is a still more exclusively meteorological sign than Leo.
At the moment of crossing the equator towards the north the sun is said to be at the first point of Aries; some thirty days later it enters Taurus, and so on through Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricornus, Aquarius and Pisces.