Nowruz (Persian: نوروز, Iranian Persian: [noːˈɾuːz], lit. 'New Day') is New Year's Day on the Iranian calendars, including the currently used Solar Hijri calendar. Historically, it has been observed by Iranian peoples, but is now celebrated by many Persianate cultures worldwide. It is a festival based on the Northern Hemisphere spring equinox, and thus usually coincides with a date between 19 March and 22 March on the Gregorian calendar.