 In China, Aryabhata's table of sines were translated into the Chinese mathematical book of the "Kaiyuan Zhanjing", compiled in 718 AD during the Tang Dynasty.Although the Chinese excelled in other fields of mathematics such as solid geometry, binomial theorem, and complex algebraic formulas, early forms of trigonometry were not as widely appreciated as in the earlier Greek, Hellenistic, Indian and Islamic worlds.Instead, the early Chinese used an empirical substitute known as "chong cha", while practical use of plane trigonometry in using the sine, the tangent, and the secant were known.