Pisces, the Fishes, is a zodiacal constellation located on the ecliptic between Aquarius and Aries. The ecliptic is the path of the Sun across the sky, defined by the Earth's orbit around the Sun. There are 13 constellations through which the ecliptic runs. Pisces is an ancient constellation comprised mostly of relatively faint stars. The Circlet, however, is an asterism that is easy to pick out. The Circlet represents the head of the western fish in Pisces. In Roman mythology, Pisces represents Venus and Cupid, who changed into fish to escape the monster Typhon. The two fishes have their tails tied together. Along with Aquarius, Capricornus, Cetus and Piscis Austrinis, Pisces is located in an area of the sky dominated by water-related constellations. Pisces is currently the location of the March equinox. This is the point in the sky where the Sun crosses the celestial equator heading into the northern hemisphere of the sky. This usually occurs around March 21, marking the beginning of spring for the northern hemisphere on Earth, and the start of fall for the southern hemisphere. The equinox is also when the length of the day and night are equal and the Sun rises due east and sets due west. The Sun is located in the constellation of Pisces from March 12 to April 18.