High Quality Content by WIKIPEDIA articles! Xi Zezong (born in Yuanqu, Shanxi, June 6, 1927) is a Chinese astronomical historian. He is best known for his finding in Ancient Chinese history of the reference to Ganymede being visible to the human eye by ancient astronomer Gan De, before it was officially recognised by the west. He is a member of the Chinese Academy of Sciences, and an Awardee of the Astronomy Prize. Xi graduated from the Astronomy Department of Zhongshan University in Zhongshan, and began a career in the Chinese Academy of Sciences in which he has spent all of his life as a professor.

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