What fortune-telling stories were there in the Tang Dynasty?

What's the story of the fortune teller who calculated the fortune of the old fisherman in The Journey to the West's sequel?

In the sequel to The Journey to the West, the fortune teller who told the fortune of the old fisherman was Yuan Shoucheng, a famous warlock in the Tang Dynasty and Yuan Tiangang's uncle. The Journey to the West describes that Yuan Shoucheng was born "grotesque and beautiful" and could distinguish between yin and yang. From the ninth time in The Journey to the West, the ingenious and selfless song, the clumsy plan of the old dragon king violated the dogma.

Because he could figure out the location of the Weihe aquarium and let fisherman Zhang figure out when he could catch fish, King Jinghe was very angry and scared, so he went to Chang 'an to find trouble and asked him to calculate the time of rain. Yuan Shoucheng was right. The Dragon King of Jinghe River thought a very, very stupid idea, and changed the hours of rain privately, and the result was known by the Jade Emperor. Violate dogma. Wei Zhi was beheaded in his dream.