After Zu Chongzhi's death, his son Zuxuan continued his father's research and further discovered the method of calculating the volume of a sphere.

There is a formula for calculating the volume of a sphere in China's ancient mathematical work Nine Chapters Arithmetic, but it is not accurate. Although Liu Hui once pointed out its mistakes, he didn't find a way to calculate them. After studying hard, Zuxuan finally found the correct calculation method. The formula he worked out to calculate the volume of a sphere is: sphere volume =π6D3(D stands for the diameter of a sphere). This formula has been used by people ever since.