I've heard that the traditional Chinese worldview was of a flat earth with China at its centre. How long did it take them to discover and establish contact with the West and adopt their knowledge of the world?
Is this a question on when China learned of Europe or America?
Also is the question also about did China know the world was spherical? If so a good answer by /u/svendskov explains why even though some knew the world was round it didn't get applied to cartography https://www.reddit.com/r/AskHistorians/comments/74n7j5/when_did_the_chinese_learn_that_the_earth_is/