How did fortune teller Wei Qianli calculate his approximate time of death?

Master Wei Qianli studied under his parents and was proficient in eight-character numerology and six divinations. So the approximate time of death should be predictable.

Liu Ren was a court occupation in ancient China. Together with Taiyi and Dunjia, it is called Type III. Ren Tong is rooted in the sea, which is the head of gossip, followed by water, which is the source of all things. The use of the sea highlights the word "source", while Qimen and Taiyi both refer to it, so it is called the first of the three, and the so-called general refers to the big.