2. As early as 20 1 1 year, the International Mathematical Association officially announced that March 14 every year was designated as the International Mathematics Festival, which originated from the pi of Zu Chongzhi, an ancient mathematician in China.

Pi day is a special day to celebrate pi. The official date is 14 March, which comes from the most commonly used approximate value of pi 3. 14. Generally, it is celebrated at 1: 59 in the afternoon to symbolize the six-digit approximation of pi 3. 14 159, and sometimes it is even accurate to 26 seconds to symbolize the eight-digit approximation of pi 3.1415926; People who are used to 24-hour timing celebrate at 65438+ 0: 59 am or 3: 9 pm (65438+05: 9 am).