Nowruz, sometimes called the Persian new year, is the official new year in Iran and it is one of the oldest Iranian traditions that has been celebrated by Iranians or people living in Greater Iran since thousands of years ago. It marks the vernal equinox (the astronomical spring) in the northern hemisphere and it coincides with the first day of the Aries constellation. In the Gregorian calendar, Nowruz or the vernal equinox happens on March 20th or March 21st. Another fun fact is that the months of the Iranian calendar coincide with zodiac constellations. Here is the name of Iranian months with their corresponding zodiac signs:
Farvardin: Aries, Ordibehesht: Taurus, Khordad: Gemini, Tir: Cancer, Mordad: Leo, Shahrivar: Virgo
Mehr: Libra, Aban: Scorpio, Azar: Sagittarius, Dey: Capricorn, Bahman: Aquarius, Espand: Pisces
Happy New Year to you, Mr. Askari.
I think everyone knows it on italki now since we Iranians kept posting it! :D