Song Armillary Sphere

Timeline

1. c. 960–1080Kaifeng Observatory · KaifengThe Northern Song court maintained an observatory in Kaifeng with large armillary spheres and abridged instruments; scholars like Shen Kuo participated in improving observational devices, correcting measurements of the obliquity of the ecliptic and polar distance, providing measured data for calendrical calculation and star catalogues.
2. 1092Water-Powered Astronomical Clock Tower, Kaifeng · KaifengSu Song presided over the construction of the Water-Powered Astronomical Clock Tower, whose armillary sphere at the top was automatically driven by a water-powered escapement wheel to track the diurnal motion of the celestial sphere, with Han Gonglian and others participating in the design; this was a representative achievement of integrating the armillary sphere with large-scale mechanical timekeeping and striking systems in ancient China.
3. 1127–1220Lin'an · HangzhouAfter the fall of the Northern Song, the Southern Song court rebuilt the Directorate of Astronomy's facilities in Lin'an, maintaining or replicating armillary spheres for observation; though smaller than the Northern Song clock tower, it continued recording eclipses and planetary positions in the early 13th century, supporting the compilation and verification of calendars such as Qiandao and Chunxi.