The Atomic Clock and International Time 

Chip scale atomic clock photo by the National Institute of Standards and Technology.

There are many devices that have been used to measure time since the concept of time began. From the position of the sun to using the ingenious sun dial to nanosecond accurate clocks today, time telling has evolved over the ages. In the history of the clock, there have been sun dials, hour glasses, water clocks, pendulum clocks and mechanical clocks. Continue reading

Page 20 of 55« First...10...1819202122...304050...Last »