Zu Chongzhi Zi Zuriheng (also known as Ri) is an outstanding mathematician and astronomer. The date of birth and death is unknown, but his birth should be in Nanqi and Houliang, and his scientific activities are mainly in Liangchu. Zuriheng inherited his father's footsteps here, and he was smart and studious since childhood, and he was proficient in astronomical calendars. In the early years of Liang Dynasty, he suggested revising the calendar twice, pointing out the shortcomings of the calendar at that time. In order to correct the alienation of He Chengtian's Yuan Jiali Calendar # After testing the gains and losses of the old and new calendars through the measured astronomical phenomena such as Taishiling, Liang Wudi sent a letter to Tian Jian for nine years, and adopted Daming Calendar to calculate the almanac # In the process, Zuriheng also revised and demonstrated it to make it more perfect # Records of Southern History, Volume 72:

"At the beginning of Tian Liang's imprisonment, Riheng revised it and began to make a difference. #" Zu Riheng confirmed the existence of precession by measuring the degree of depolarization of Beichen nova. He also built an eight-foot copper watch in Songshan (now Dengfeng County, Henan Province) as a sundial # Zu Riheng who copied the ancient astrological records and wrote Astronomical Records and Essentials of Astronomical Records. Teach the science of astronomical calendar to scientist Xin, and have academic exchanges with each other # Zu Riheng was an official in the Liang Dynasty for a long time, and served as a regular waiter outside Yuan Qi, a teacher, a general, and a satrap in Nankang.

Zu Hao, the son of Zu Riheng, is also good at astronomical calendar calculation, and can make good use of # 72 years of Southern History: "Hao, the son of Riheng, has a strong ambition, a literary style and a military strategy # and is rarely inherited. He is good at calculating the calendar # and worships the king of Guangling # "In an armed rebellion, Zuhao organized a counterattack and was defeated, so he was tortured. Does Zuhao have astronomical calendar calculation?