Nowruz, the Iranian New Year, has been celebrated for over 3,000 years, marking the spring equinox and featuring various rituals among diverse ethnic and religious groups. Its origins are linked to ancient Iranian religions, primarily Zoroastrianism, and it has evolved through multiple historical periods, serving as a significant secular and religious celebration. The document also highlights the cultural significance and enduring traditions associated with Nowruz across different dynasties in Persian history.