The Vernal Equinox is the point at which, on Earth, the sun crosses the equator and in the sky crosses the celestial equator which lies in the constellation Pisces. This occurs on or about March 21st in the Northern Hemisphere and on our about September 23rd in the Southern Hemisphere.
Traditions and Astrology
The spring or Vernal equinox is a time period when the day and night are said to be equal. It is often celebrated as a holiday by Witches and Pagans of many traditions. It is given many names including Ostara, Eostre, and Alban Eilir.