1, sundial is a Chinese character, pronounced as guǐ, which originally means the shadow of the sun, a metaphor for time, such as the sundial, and another meaning is the ancient instrument used to observe the sun's shadow as well as set the moment.

2, the text in the "Han Shu - Li Xun biography" and "Song Shu - Xie Zhuang biography" and other documents are recorded.

3, and "rhyme supplement" Ye Guo Xu cut. Lu Yun Poetry" wish to ascend the Fusang, Yang knot sundial. I am not surviving, who is the remains of the fragrance.