In the ancient Zhen Kingdom, there was a Tiangang bucket handle, which was placed on the altar of the five tribes. In order to calm the dispute between the five tribes, they made an oath: the bucket handle points east, Rigel is in charge, the Jiao tribe is the leader, and the world is winter; the bucket handle south It means that when the Water Committee is in charge and the Bi people are in charge, the world is spring; when the handle of the bucket is pointed to the west, when Bisu is in charge and the Ti people are in charge, it is summer in the world; when the handle of the bucket is pointed to the north and the South Gate is in charge and the Mun people are in charge, it is autumn all over the world.