A more precise definition of the second is crucial to all sorts of physical measurements – but to get there, scientists have ...

Japan puts world's most accurate clock on sale for $3.3 mn Resembling ... Optical lattice clocks have previously been installed in Tokyo's famous Skytree to test the general theory of relativity ...

Further west, a piece of history is visible at Calgary city hall. Its clock dates back to 1911 and is believed to be one of the only ones left in Canada made by the famous Seth Thomas Clock Company.