Zodiacal constellation in the northern hemisphere between Pisces and Taurus, near Auriga, represented as the legendary ram whose golden fleece was sought by Jason and the Argonauts.

Its most distinctive feature is a curve of three stars of decreasing brightness. The brightest of these is Hamal or Alpha Arietis, 65 light-years from Earth.

The point at which the sun, traveling from south to north on the ecliptic, crosses the celestial equator.

Identical to the vernal equinox.