The armillary sphere was an instrument used to measure the location of celestial bodies in ancient China.It was first invented in the Warring States Period(475 - 221 B.C.), and was improved.

• 浑仪是中国古代测定天体位置的仪器，发明于战国时期（公元前475--公元前221年），唐宋时期趋于完善。