Introduction to the Armillary Sphere: When Shen Kuo was in charge of leading the Si Tianjian, he made an exception and recommended Wei Pu, a Huainan native who was proficient in astronomical calculations and a commoner, to enter the Si Tianjian and presided over the important work of revising the new calendar. He studied and reformed the armillary sphere and the floating sphere. Old astronomical observation instruments such as telescopes and shadow tables.