001 Architecture Gaocheng Observatory Later texts traced ancient Yangcheng’s tradition of measuring solar shadows back to the Duke of Zhou in the Western Zhou. A stone gnomon was erected here in the Tang, and the Yuan added a forty-chi-high observatory in the form of a monumental gnomon. Liu Dunzhen’s 1930s survey for the Society for Research in Chinese Architecture preserved measured drawings and photographs taken before the site was shelled; the restoration plan entrusted to the Society was never carried out because war intervened. Japanese artillery destroyed the eastern chamber atop the terrace during the 1944 Central Henan Campaign. After the 1975 restoration, two shell holes were retained in the east wall. Western Zhou Gaocheng Town, Dengfeng, Henan Province Dengfeng Observatory · Gaocheng Observatory in Dengfeng · Duke of Zhou Shadow-Measuring Terrace →