Nowruz is the name of the New Year in Iranian calendars and the corresponding traditional celebrations. Nowruz is also widely referred to as the Persian New Year and marks the first day of Spring and the beginning of the year in the Persian calendar. It is celebrated on the day of the astronomical Northward equinox, which 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.
Nowruz is celebrated by people from diverse ethnic communities and religious backgrounds 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. It originated in Persia in one of the capitals of the Achaemenid empire in Persis (Fars) in Iran and is also celebrated by the cultural region that came under Iranian influence or had migrations by Persians, including Afghanistan, Azerbaijan, the North Caucasus, the Kurdish areas in the Middle East, Tajikistan, Turkmenistan, Uzbekistan, Kyrgyzstan, Kazakhstan and other scattered populations in Central and South Asia.