This short episode covers the life of one of the great mathematicians, astronomers, and engineers of ancient China: Zu Chongzhi. In his life from 429-500 CE, he will re-create an ancient precursor to the compass that had been lost for centuries, calculate the motions of the celestial objects with a degree of accuracy in excess of 99.9%, design a comprehensive new calendar system, and derive the value of π to a degree of accuracy that would not be surpassed the world over for another millennium.

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