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Zou Yan (Chinese: 鄒衍/邹衍; pinyin: Zōu Yǎn; Wade-Giles: Tsou Yen; 305 BC - 240 BC) was the representative thinker of the School of Yin-Yang (or School of Naturalists) during the Hundred Schools of Thought era in Chinese philosophy. Joseph Needham, a British sinologist, describes Zou as (1978:142) "The real founder of all Chinese scientific thought." His teachings combined and systematized two current theories during the Warring States Period: Yin-Yang and the Five Elements/Phases (wood, fire, earth, metal, and water).

All of Zou Yan's writings were lost and are only known through quotations in early Chinese texts. The best information comes from his brief biography in the Records of the Grand Historian (1st century BC) by Sima Qian. It describes him as a polymath (philosopher, historian, politician, naturalist, geographer, astrologer) who came from the coastal state of Qi (present day Shandong), where he was a member of the state-sponsored Jixia Academy (稷下).

He saw that the rulers were becoming ever more dissolute and incapable of valuing virtue. ... So he examined deeply into the phenomena of the increase and decrease of the Yin and the Yang, and wrote essays totaling more than 100,000 words about their strange permutations, and about the cycles of the great sages from beginning to end. His sayings were vast and far-reaching, and not in accord with the accepted beliefs of the classics. First he had to examine small objects, and from these he drew conclusions about large ones, until he reached what was without limit. First he spoke about modern times, and from this he went back to the time of [Huang Di]. The scholars all studied his arts. ... He began by classifying China's notable mountains, great rivers and connecting valleys; its birds and beasts; the fruitfulness of its water and soils, and its rare products; and from this extended his survey to what is beyond the seas, and men are unable to observe. Then starting from the time of the separation of the Heavens and the Earth, and coming down, he made citations of the revolutions and transmutations of the Five Powers (Virtues), arranging them until each found its proper place and was confirmed (by history). [Zou Yan] maintained that what the Confucians called the "Middle Kingdom" (i.e. China) holds a place in the whole world of but one part in eighty-one. … Princes, dukes and great officials, when they first witnessed his arts, fearfully transformed themselves, but later were unable to practice them. (tr. Needham 1978:142-143)

Zou Yan is commonly associated with Daoism and the origins of Chinese alchemy, going back to the (ca. 100 AD) Book of Han that calls him a fangshi (方士 [literally "technique master"] "alchemist; magician; exorcist; diviner"). Holmes Welch proposes the fangshi were among those whom Sima Qian described as "unable to practice" Zou Yan's arts, and says while Zou "gradually acquired alchemistical stature, he himself knew nothing of the art. It was probably developed by those of his followers who became interested in physical experimentation with the Five Elements." (1957:96-97)

• Five elements (Chinese philosophy)
• Jiuzhou
• Yin and Yang

• Needham, Joseph. 1978. The Shorter Science and Civilisation in China. Colin A. Ronan, ed. Cambridge: Cambridge University Press. ISBN 0-521-21821-7
• Welch, Holmes. 1957. Taoism: The Parting of the Way. Boston: Beacon Press. ISBN 0-8070-5973-0

• Jixia Naturalistic Thought, Indiana University
• Tsou Yen, Wolfram Eberhard, A History of China
• Yin-Yang and the Five Agents, Liu Zhongyu

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