Zhoubi Suanjing

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Zhoubi Suanjing
The Gougu Theorem diagram added to the Zhoubi by Zhao Shuang
Zhoubi Suanjing
Traditional Chinese	周髀算經
Simplified Chinese	周髀算经
Transcriptions Standard Mandarin Hanyu Pinyin Zhōubì suànjīng Wade–Giles Chou-pi Suan-ching
Zhoubi
Chinese	周髀
Literal meaning	The Zhou gnomon On gnomons and circular paths
Transcriptions Standard Mandarin Hanyu Pinyin Zhōubì Wade–Giles Chou-pi
Zhoubi
Traditional Chinese	算經
Simplified Chinese	算经
Literal meaning	Classic of computation Arithmetic classic
Transcriptions Standard Mandarin Hanyu Pinyin Suànjīng Wade–Giles Suan-ching

The Zhoubi Suanjing, also known by many other names, is an ancient Chinese astronomical and mathematical work. The Zhoubi is most famous for its presentation of Chinese cosmology and a form of the Pythagorean theorem. It claims to present 246 problems worked out by the Duke of Zhou as well as members of his court, placing its composition during the 11th century BC. However, the present form of the book does not seem to be earlier than the Eastern Han (25–220 AD), with some additions and commentaries continuing to be added for several more centuries.