Zhang Heng
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Zhang Heng, courtesy name Pingzi, formerly romanized Chang Heng, was a Chinese polymathic scientist and statesman who lived during the Eastern Han dynasty. Educated in the capital cities of Luoyang an
A statue depicting Zhang Heng at his tomb in Nanyang, Henan province, China
A pottery miniature of a palace made during the Han dynasty; as a palace attendant, Zhang Heng had personal access to Emperor Shun and the right to escort him
Eastern Han tomb brick depicting the courtyard of a wealthy family's home. Zhang enjoyed a short period of retirement at his home in Xi'e, Nanyang, before being called back to the capital, where he died in 139.
Eastern Han tomb models of watchtowers; the one on the left has crossbowmen in the top balcony. Zhang wrote that Western Han emperors were entertained by displays of archery from the balconies of towers along Chang'an's Kunming Lake.
Chinese mathematics
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Mathematics emerged independently in China by the 11th century BCE. The Chinese independently developed a real number system that includes significantly large and negative numbers, more than one numer
Visual proof for the (3, 4, 5) triangle as in the Zhoubi Suanjing 500–200 BCE
Liu Hui's Survey of sea island
Statue of Zu Chongzhi.
Li Ye's inscribed circle in triangle:Diagram of a round town