There is an argument that a Chinese astronomer observed and documented a Jovian satellite in the 4th century BC. [1] [1] http://en.cnki.com.cn/Article_en/CJFDT

There is an argument that a Chinese astronomer observed and documented a Jovian satellite in the 4th century BC. [1] [1] http://en.cnki.com.cn/Article_en/CJFDTOTAL-TTWL198102000.htm http://en.cnki.com.cn/Article_en/CJFDTOTAL-TTWL198102000.htm