Historical records of Taoist patron saint

"Ancient History of Tiangong" records, "Black Dragon in the East Palace, Zhu Bird in the South Palace, Fairy Pool in the West Palace, Gong Bei Xuanwu." This is not a white tiger, but a salty pool. Salty pond is the star of staple food. Mainly in autumn, because the grain is harvested in autumn, it is released in autumn. But it's not an animal. How can it be combined with dragons, birds and turtles into four spirits? In "Justice": "The three stars in Xianchi are among the five cars, and the sky hits the south, and the fish and birds also scream." Therefore, the song dynasty questioned:' black dragon, Zhu bird, Xuanwu, seven nights are considered together. As for Xianchi, don't be a star and stay away from 28 nights. There is another explanation for the salty pool, which is where the sun bathes. In Huai Nan Zi. Astronomy:' The sun rises in the valley, bathes in the salty pool and blows on the hibiscus, which is called morning light'. It can be seen that Xianchi was originally regarded as the sunrise place by Qiang people. Xianchi is also an alkali lake, which should be Minshan area or Shantou Lake in Qinghai. It can be proved that the astrology worshipped by primitive people does not have the concept of dragon and white tiger. The Book of Rites says:' Returning to the dragon in the face of the wind is called the Four Spirits.' Replace the salty pool that does not belong to animals with Kirin. Later generations have the habit of four spirits, four elephants and four tigers.