London atomic clock

The International System of Units SI defines one second as the time it takes a Cesium atom at the ground state to oscillate exactly 9,,, times. Atomic clocks are designed to detect this frequency, most of them today using atomic fountains ; a cloud of atoms that is tossed upwards by lasers in the Earth's gravitational field. If one could see an atomic fountain, it would resemble a water fountain. If TAI is so precise, why use leap seconds?

To achieve the highest possible level of accuracy, the International Bureau of Weights and Measures combines the output of about atomic clocks in 69 national laboratories worldwide to determine TAI. The time scale is weighted, prioritizing the time signal provided by institutions that maintain the highest quality of primary cesium. The high level of precision achieved by using atomic clocks is both a blessing and a curse. On the one hand, accurate time-keeping is a necessity, for example for time-sensitive technology, such as modern air traffic control systems that rely on satellite navigation.

Here is an overview of the most important time signal transmitters, where they are located and how they are received. Smartwatches are currently conquering the watch market at all levels. Be it as a help for a sporty everyday life, as a useful outdoor utensil for adventure seekers or as a fashionable companion that enhances any outfit - and of course to always display the accurate time.

A small introduction to the watch world 2. Next to smart watches GPS world time watches are the outstanding technical innovation on the watch market in recent years. They determine the position by means of GPS signals and can thus specify the exact local time of day anywhere in the world - independent of time signal transmitters.

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