The astronomical observatory in longest continuous use in the world is …
No, it’s not England’s world-famous Greenwich Observatory, creator of “Greenwich Mean Time.” It is the Ming Dynasty’s observatory in central Beijing. Near the southeastern corner of the old City Wall, the Beijing Ancient Observatory, originally built in 1442, is 233 years older than Greenwich.
The eight sets of astronomical instruments on the observatory’s roof have had a distinguished scientific past. Their design was strongly influenced by the Renaissance in Europe but they have some distinctive Chinese elements such as dragons and lions. The observatory’s treasures were pillaged in the 1900 war by marauding foreign troops retaliating for the lengthy siege of diplomats and Chinese Christians in the nearby Legation Quarter by Boxer cultists and the Qing military. Germany, defeated in the First World War, was the first nation to return the stolen treasure.
Today, the observatory is a small gem for in-the-know Beijingers (and a very few international tourists). There are interesting historical displays in the Ziwei Palace and some fascinating astronomical devices.