Gan De

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Gan De (甘德) was an ancient Icons-flag-cn.png Chinese astronomer. According to other Chinese astronomer Xi Zezong, his observation of a "small reddish star" near the planet Jupiter was its moon Ganymede. His observation was made almost 2,000 years before Galileo Galilei's observation of the satellite, making him the true discoverer of Ganymede.[1]


  1. Zezong, Xi, "The Discovery of Jupiter's Satellite Made by Gan De 2000 years Before Galileo", Chinese Physics 2 (3) (1982): 664–67.

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