Yi Xing
8th-century Buddhist monk and astronomer / From Wikipedia, the free encyclopedia
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For the Vietnamese monk with the same Chinese dharma name, see Thích Nhất Hạnh. For the city in Jiangsu, see Yixing. For the member of EXO, see Lay (entertainer).
Yi Xing (Chinese: 一行; pinyin: Yī Xíng; Wade–Giles: I-Hsing, 683–727), born Zhang Sui (Chinese: 張遂), was a Chinese astronomer, Buddhist monk, inventor, mathematician, mechanical engineer, and philosopher during the Tang dynasty. His astronomical celestial globe featured a liquid-driven escapement, the first in a long tradition of Chinese astronomical clockworks.