At 7:21 pm tonight Nowruz starts, time of nature's renewal, Nowruz marks the first day of spring and the beginning of the year in Persian calendar. It is celebrated on the day of the astronomical vernal equinox. As well as being a Zoroastrian holiday and having significance amongst the Zoroastrian ancestors of modern Iranians, the same time is celebrated in parts of the South Asian sub-continent as the new year. The moment the Sun crosses the celestial equator and equalizes night and day is calculated exactly every year and Iranian families gather together to observe the rituals.
Nowruz is celebrated by over 300 million people of Iran, Afghanistan, Tajikistan, Kurdistan, Turkey, ... all around the world has arrived.