Nowruz, also known as Persian New Year, is an ancient festival that has been celebrated for over 3,000 years in Iran and other countries in the Persian cultural sphere. The word "Nowruz" means "new day" in Persian, and the festival marks the beginning of spring and the start of the new year in the Persian calendar. The origins of Nowruz can be traced back to the Achaemenid Empire, which ruled over Persia from the 6th to the 4th century BCE.