Gaocheng Astronomical Observatory

Gaocheng Astronomical Observatory, also known as the Dengfeng Observatory, is an observatory in the shrine of the Duke of Zhou in Gaocheng Town, near Dengfeng in Henan province, China. The site has a long tradition of astronomical observation, from the time of the Western Zhou up to the early Yuan dynasty. It holds a gnomon used for the Da Yan calendar in 729 AD and the great observatory of the Yuan dynasty. As part of the Historic Monuments of Dengfeng in the Center of Heaven and Earth, the observatory was listed as a UNESCO World Heritage Site in 2010.