No-Rooz, in word, means "New Day". It is the new day that starts the year, traditionally the exact astronomical beginning of the Spring. Iranians take that as the beginning of the year. This exact second is called "Saal Tahvil". No-Rooz with its' uniquely Iranian characteristics has been celebrated for at least 3,000 years and is deeply rooted in the rituals and traditions of the Zoroastrian (This was the religion of ancient Persia before the advent of Islam in 7th century A.D.).