==See also==* Chinese star maps* Hipparchus* Nicolaus Copernicus* Galileo Galilei==Notes====References==*X. Zezong, The Discovery of Jupiter's Satellite Made by Gan De 2000 years Before Galileo, "Chinese Physics" 2 (3) (1982): 664-667.
* "X. Zezong", The Discovery of Jupiter's Satellite Made by Gan De 2000 years Before Galileo, Chinese Physics 2 (3) (1982): 664-667.