In harmony with the rebirth of nature, the Iranian New Year Celebration, or NOROOZ, always begins on the first day of spring.
Norooz ceremonies are symbolic representations of two ancient concepts - the End and the Rebirth; or Good and Evil.
The origins of Norooz are unknown, but they go back several thousand years predating the Achaemenian Dynasty.
The ancient Iranians had a festival called "Farvardgan" which lasted ten days, and took place at the end of the solar year. It appears that this was a festival of sorrow and mourning, signifying the end of life while the festival of Norooz, at the beginning of spring signified rebirth, and was a time of great joy and celebration.