CIIC:Today's featured article/April17, 2011
From Wiki China org cn
Established by theYuan astronomer Guo Shoujing (1231-1316), the Observatory at Dengfeng is the oldest of its kind in China. (More...)
Established by theYuan astronomer Guo Shoujing (1231-1316), the Observatory at Dengfeng is the oldest of its kind in China. (More...)