Milü

Pi approximations by astronomer Zu Chongzhi

Milü, also known as Zulü, is the name given to an approximation to π (pi) found by Chinese mathematician and astronomer Zu Chongzhi in the 5th century. Using Liu Hui's algorithm, Zu famously computed π to be between 3.1415926 and 3.1415927 and gave two rational approximations of π, ⁠22/7⁠ and ⁠355/113⁠, naming them respectively Yuelü and Milü.

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