CIIC:Today's featured article/April17, 2011
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Revision as of 02:09, 14 April 2011 by imported>Ciic (Created page with 'thumb|200px|the Observatory at Dengfeng Established by the Yuan astronomer Guo Shoujing (1231-1316), the observatory is the oldest of its kind in China. ...')
Established by the Yuan astronomer Guo Shoujing (1231-1316), the observatory is the oldest of its kind in China. (More...)
