This remarkable astronomical clock is one of only two known examples ... rings can be used for telling the time in both Western and Chinese cultures. The inner brass ring marks the seasons.

Usher, A. P., “A History of Mechanical Inventions”, pp. 191 ff., 304 ff., 2nd edit. (Harvard Univ. Press, Cambridge, Mass., 1954). Diels, H., “Über die von ...

Chile has put a planned Chinese astronomical observatory project under ... which operates round-the-clock monitoring satellites thousands of kilometres from mainland China. The Asian superpower ...