What does the Yang Yi Bureau of Daoism mean?

In contemporary Daoism, this model includes the changes of nine-game yang dun and nine-game yin dun. The male pier type is used after the solstice in winter and before the solstice in summer, and the female pier type is used after the solstice in summer and before the solstice in winter. The pattern of yang dun is that six friends and three flags are reversed, and the pattern of yin dun is that six friends and three flags are reversed. In the first game of Yang, Jiaziwu was on duty in the first palace of the site, and on this basis, six friends were arranged in order and three flags were reversed.