Why is a circular mountain on the moon called "Zu Chongzhi Mountain"?

Zu Chongzhi in ancient China calculated pi between 3.1415926 and 3.1415927, which was the most accurate value in the world at that time. In order to commemorate him, people gave a crater on the moon as Zu Chongzhi Mountain. There are four mountains on the moon named after ancient scientists in China.