Analysis of the New Year's Day of the Pu-mi Ethnic Group

The Pu-mi ethnic group uses the seventh or eighth day in the twelfth month of the Chinese lunar/solar calendar as their New Year's Day right now.However, this convention appeared after the Pu-mi people adopted the Chinese lunar/solar calendar to replace their original solar calendar.Based on their original solar calendar, their New Year's Day was the day in which the Pleiades rose to the upper transit just after the dusk.This celestial phenomenon was first observed by the Pu-mi people in the middle of the third century A.D.Considering the migration history of the Pu-mi ethnic group, the transformation of their New Year's Day to the current convention happened not after the middle of the eighth century A.D.