Visible even during the daytime, its appearance electrified all of China. Astronomers at the imperial observatory worked day and night making careful and continual observations until the object finally disappeared from sight 643 days later in April of 1056.
當時國家天文台──司天監工作人員「日夜加班」，仔細觀測，直到嘉祐元年三月辛未日（一○五六年），這顆亮星消失為止，長達六百四十三天，記錄不曾間斷。