According to WP, the Chinese belief in a flat, square earth surrounded by round heavens was "an assumption virtually unquestioned until the introduction of European astronomy in the 17th century"? Is there a record of anyone in China questioning this before the 17th century? How likely is it that no one in China suspected a round earth until the 17th century?
The Chinese scientist Shen Kuo (1031-1095) Jing Fang (78–37 BC) Zhang Heng (AD 78–139) all believed and argued that the sun and moon are spherical but oddly enough there is no record of them suggesting the earth is anything but flat.