What is the reason you think that the Chinese failed to conclude that the Earth is round?
In the Tang Dynasty, Emperor Xuan Zong唐玄宗 commissioned the monk Yi Shin (一行禪師)（683－727 A.D.） to conduct a comprehensive survey of the height of the Pole Star and the shadow of a stick on summer/winter solstices noon in 13 cities, from Inner Mongolia in the North to Vietnam in the South. The monk determined that the altitude of the Pole Star changed by 1° when he moved 131 km north-south. If the monk had multiplied 131 km by 360, he would have arrived at a value of 47,160 km for the Earth’s circumference. However, he failed to draw the conclusion that the Earth was round. In fact, the Chinese continued to believe that the Earth was flat until the arrival of European missionaries during the Ming Dynasty in the early 17th century.
(see Chapter 12 of "Our Place in the Universe")
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