Qintianjian

The Qintianjian (simplified Chinese: 钦天监; traditional Chinese: 欽天監; pinyin: Qīntiānjiàn; lit. 'Bureau for Revering Heaven'), commonly translated as the Imperial Astronomical Bureau or Directorate of Astronomy, was the official institution of the Chinese imperial state responsible for astronomical observation, calendar production, timekeeping, and the interpretation of celestial and cosmological phenomena on behalf of the emperor. The bureau and its predecessor institutions served these functions across successive Chinese dynasties from antiquity until the fall of the Qing dynasty in 1912.

The Qintianjian occupied a distinctive position within the Chinese bureaucratic system, as its responsibilities encompassed both what would today be classified as astronomical science — systematic observation of celestial bodies, prediction of eclipses, and maintenance of the official calendar — and functions more closely associated with divination and astrology, including the selection of auspicious dates for state activities and the interpretation of unusual celestial events as omens. This dual function reflected the traditional Chinese understanding that celestial and terrestrial phenomena were fundamentally connected, a principle central to the concept of the Mandate of Heaven (天命, tiānmìng).