Half the fun of getting vintage test equipment is getting ... relativity indicates that time slows down with increasing gravity. Therefore, using airborne Cesium clocks, you could fly a clock ...

Optical lattice clocks have previously been installed in Tokyo's famous Skytree to test the general theory of relativity, which states that "time flows more slowly in places with strong gravity".

This weekend, Daylight Saving Time begins ... of engineering at the New York Edition Hotel, with equipment that controls one of the big clocks on the face of the hotel, in the former Metropolitan ...