The kangxi dictionary, completed in the qing dynasty ( 1644 a.d.-1911 a.d. ) and released in the 55th year of the reign of emperor kangxi ( 1716 a.d. ), was the world 's earliest and biggest dictionary with 47035 entries of chinese characters . 中国清代的《康熙字典》是世界上最早、字数最多的字典。
The celestial globe invented by zhang heng, chinese scientist of the east han dynasty ( 25 a.d .-220 a.d. ), was the first of its kind in the world. it determined that the angular diameter of both the sun and the moon was 0.5 . 中国东汉科学家张衡发明的天球仪是世界上最早的天球仪。