Around 480 AD, Zu Chongzhi, a mathematician in China, studied hard and made repeated calculations. Pi is calculated to the seventh place after the decimal point, which is an infinite acyclic decimal, which is earlier than the same result obtained by foreign mathematicians later 1000 years.

Zu Chongzhi studied natural science all his life, mainly contributing to mathematics, astronomical calendar and mechanical manufacturing. On the basis of exploring the accurate method of pi pioneered by Liu Hui, he calculated pi to the seventh place after the decimal point for the first time, that is, between 3. 14 15926 and 3. 14 15927.

Brief introduction of Zu Chongzhi's life.

Zu Chongzhi was born in Jiankang in 429 AD. Generations have been studying astronomical calendars, and Zu Chongzhi has been exposed to astronomical and mathematical knowledge since childhood. Zu Chongzhi gained a reputation as a scholar when he was young. When Emperor Xiaowu of Song heard about it, he sent him to the "Hualin Studies Province" to do research work. In 46 1 year, he worked in the secretariat of southern Xuzhou (now Zhenjiang, Jiangsu), and successively served as a historian and government official in southern Xuzhou.

In 464 AD, he was transferred to Lou County (now northeast of Kunshan, Jiangsu Province) as county magistrate. During this period, he compiled Da Li Ming and calculated pi. At the end of the Song Dynasty, Zu Chongzhi returned to Jiankang as a servant. After that, he spent a lot of energy studying mechanical manufacturing until the demise of the Song Dynasty. Zu Chongzhi died in 500 AD at the age of 72.