How did Song Huiyao record the supernova of 1054?

"Song Hui Yao" records: "In the morning of May of the first year of He Zhi, he left the East Gate and closed the sky. When I saw it in the daytime, I saw that it was white, with its horns sticking out in four directions, and its colors were red and white. Whenever I see it on the 23rd. " To May of the first year, which is equivalent to June and July of A.D. 1054, the star is Taurus ξ. This is a record of supernovae observed by the celestial supervisor at that time.