If you visit the Copenhagen City Hall, you’ll see an ornate mechanical clock. By itself, this is unremarkable, of course. There are plenty of ornate clocks in city halls around the world, but this one ...

The 3.5-foot timepiece, which includes an automaton, is on loan to the Paris museum until November. By Nazanin Lankarani Reporting from Paris Ancient water clocks, the astronomical devices of the ...

All living creatures are affected by the cycles of celestial objects. Humans have always been locked into the rhythms of sunrise and sunset, the phases of the Moon, and the seasons. We left some of ...