Zu Chongzhi also gave two fractional forms of pi: 22/7 (approximate rate) and 355/ 1 13 (density rate), in which the density rate is accurate to the seventh decimal place. Zu Chongzhi's accurate calculation of pi is a great contribution to China and even the world. Later generations named him "Zu Chongzhi Pi".
Extended data
Family background:
Zu Chongzhi was born in Jiankang (now Nanjing) in 429 (the sixth year of Yuanjia in the Southern Song Dynasty), and his ancestral home was in Qixian County (now Laishui County, Hebei Province). At the end of the Western Jin Dynasty, a large-scale war broke out in the north, and Zu Chongzhi's ancestors migrated from Hebei to the south of the Yangtze River to settle down.
Zu Chongzhi was born in Jiangnan. His grandfather Zuchang was a great craftsman of Liu in Song Dynasty. He is an official in charge of civil engineering in the imperial court. His father, Zushuo, is knowledgeable and often invited to attend royal ceremonies and banquets.
Zu Chongzhi received a good family education from an early age. Grandpa told him "The Stars Move", his father led him to read the classics, his family's edification and his own diligence made him interested in natural science, literature, philosophy, especially astronomy, and he gained a reputation for erudition in his youth.
Baidu Encyclopedia-Zu Chongzhi