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.
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- 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。