WorldHistoryPics.com 7 January 2021 English Gaocheng Astronomical Observatory, Dengfeng, China, Yuan Dynasty, 1276 AD Flickr user ID: 101561334@N08 author name...
WorldHistoryPics.com 7 January 2021 English Gaocheng Astronomical Observatory, Dengfeng, China, Yuan Dynasty, 1276 AD Flickr user ID: 101561334@N08 author name...
WorldHistoryPics.com. Date 11 June 2010, 14:02 Source 1276 AD Yuan Dynasty Gaocheng Astronomical Observatory, Dengfeng, China Author Gary Todd from Xinzheng, China...