[custom_adv] Nowruz is the New Year, also known as the New Year, which is celebrated worldwide by various ethno-linguistic groups. [custom_adv] Despite its and Zoroastrian origins, Nowruz has been celebrated by diverse communities. It has been celebrated for over 3,000 years in Western Asia, Central Asia, the Caucasus, the Black Sea Basin, and the Balkans. [custom_adv] It is a secular holiday for most celebrants that is enjoyed by people of several different faiths, but remains a holy day for Zoroastrians, Bahais, and some communities. [custom_adv] Nowruz is the day of the vernal equinox, and marks the beginning of spring in the Northern Hemisphere. It marks the first day of the first month (Farvardin) of the calendar. [custom_adv] It usually occurs on March 21 or the previous or following day, depending on where it is observed. [custom_adv] 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. [custom_adv] In the Shahenshahi and Kadmi calendars, which do not account for leap years, the New Year's Day has drifted ahead by over 200 days. [custom_adv] A variety of spelling variations for the word nowruz exist in English-language usage, including novruz, nowruz, nauruz and newroz.