Time dilation, a captivating concept embedded in Einstein’s theory of relativity, has been experimentally validated on Earth.

Atomic clocks use quantum physics and the resonant frequency of atoms, like cesium, to define time.

On Sept. 2, 1752, the British switched from the Julian calendar to the Gregorian calendar. To make this work, Wednesday, Sept ...

If, like me, you can't go a day without making sure your watch is synced to the second, you'll be delighted to learn that a new atomic clock has broken the record with an accuracy of 5.5 x 10 ...

From ancient sundials to today's atomic clocks, the quest to quantify time has profoundly influenced civilization. The atomic clock, a marvel of modern science that measures the oscillation of ...

According to scientists at NIST in Boulder, their newest atomic clock, the NIST-F4, will help track time more precisely and help put global time on a more accurate frequency.

The signal from this tuning fork—about nine gigahertz—is used to calibrate about 18 smaller atomic clocks at NIST that run 24 hours a day.

The optical atomic clocks use paired but asynchronous optical combs in a Vernier arrangement to downconvert the clock signal to the more manageable RF band.

A radio-controlled clock has a radio inside, which receives a signal that comes from a place where an atomic clock is located, so they are always accurate, according to the National Institute of ...