Around 480 AD, Zu Chongzhi, a mathematician in China, calculated pi to the seventh place after the decimal point through hard study and repeated calculus, and came to the conclusion that this is an infinite cycle decimal, which is earlier than the result obtained by foreign mathematicians later 1000 years.

On the basis of Liu Hui, Zu Chongzhi calculated the pi to seven places, between 3. 14 15926 and 3. 14 15927. Later generations named it "Zu Chongzhi Pi" after him, or "Ancestral Rate" for short. It was not until the 5th century A.D./kloc-that Al Cassie, an Arab mathematician, broke this record and got pi = 3.14159265358979325, and the exact number was 17. So it is nearly 1000 years earlier than foreign countries.

Personal achievements:

Zu Chongzhi crater

In order to commemorate this great ancient scientist, 1967, the International Federation of Astronomers named a crater on the moon "Zu Chongzhi Crater".

1964 Volume I

1964165438+1On October 9th, in order to commemorate Zu Chongzhi's great contribution to China and the world's science and culture, the Purple Mountain Observatory named the asteroid with the international permanent number 1888 discovered in1964 as "Zu Chongzhi Star".

Zu Chongzhi silver coin

This commemorative silver coin was issued in 1986, with a face value of 5 yuan, a fineness of 90 and a circulation of 30,000 pieces. The commemorative coin has the national emblem on the front and the Zu Chongzhi on the back, with a diameter of 36 mm and a weight of 22 grams. This is made by Shanghai Mint.