I know that the idea that humans have 360 joints appears in a few old sources. One is from the Islamic tradition, from Sahih Muslim 1007a, a text that was first written maybe in the 9th century AD. I also know it appears in another text known as the Luxuriant Dew of the Spring and Autumn Annals, attributed to Dong Zhongshu in the 2nd century BC, which states that “Man has 360 joints, which match the number of Heaven (the round number of days in a year)” (Wing-Tsit Chan, A Source Book in C...
