How did the armillary sphere get its Chinese name of huntianyi (" celestial sphere instrument ")? In ancient times the Chinese had three conceptions of the universe, called the" celestial dome "theory, the" celestial sphere "theory, and the" infinite space "theory.
為什麼叫做渾儀？中國古代有三種宇宙觀，分別是「蓋天說」、「渾天說」，和「宣夜說」。