Table 1 One chi-measure unit to the official chi in some Chinese dynasties (unit: mm)
Dynasty | Xia, Shang (Around 2070–1046 BC) | Three Kingdoms, Wei, Jin (220–420 AD) | Southern Dynasty (420–589 AD) | Tang (618–907 AD) | Northern Song (960–1127 AD) | Southern Song (1127–1279 AD) | Yuan (1271–1368 AD) | Ming (1368–1644 AD) | Qing (1644–1911 AD) |
|---|---|---|---|---|---|---|---|---|---|
Official chi | 160–170 | 231 | 247–250 | 295 | 309 | 274 | 307 or 350 | 318–320 | 320 |
