Nowruz, literally “New Day is the name of the Iranian New Year, also known as the Persian New Year which is celebrated worldwide by the Iranian peoples, along with some other related ethno-linguistic groups, as the beginning of the New Year.
It has been celebrated for over 3,000 years in the Balkans, the Black Sea Basin, the Caucasus, Central Asia, and Western Asia. It marks the first day of Farvardin in the Iranian calendar.
Nowruz is the day of the vernal equinox, and marks the beginning of spring in the Northern Hemisphere. It usually occurs on March 21 or the previous/following day, depending on where it is observed. The moment the sun crosses the celestial equator and equalizes night and day is calculated exactly every year, and families gather together to observe the rituals.
Although having Iranian and religious a Zoroastrian origin, Nowruz has been celebrated by people from diverse ethno-linguistic communities for thousands of years. It is a secular holiday for most celebrants that is enjoyed by people of several different faiths, but remains a holy day for Zoroastrians.
Nowruz is the most important holiday in Iran, marking the official New Year of the country. It is the first day of Farvardin, the first month of the Iranian solar calendar. In Iran, families celebrate the New Year since the exact time of the March equinox, which is calculated every year.