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Navroz marks the first day of spring or Equinox 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.
Navroz 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.