How did Zhuge Liang know that Liu Biao would die? Thank you.

It is a kind of divination, just look at the stars in the sky. You can refer to the vernacular version of Romance of the Three Kingdoms, which is described in this article. Sima Yi also saw Zhuge Liang dying that day, but Zhuge Liang used magic to hide it from him. The myth part of the article belongs to piping. He predicted to Cao Cao that "there will be a flow in the south of Dingjun Mountain on March 8". He said that in the twenty-four years of Jian 'an, a relative of Cao Cao died in the south of Dingjun Mountain. In the end, it all came true. .