The most accurate clock in the world Why

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The earth is a natural timekeeper. It takes the earth to rotate in one day – 24 hours. One in eighty-six thousand four hundredth is one second. This is how the unit of time in seconds is derived.

2 However, it was later discovered that the Earth was not a very accurate "clock" due to many factors, such as tidal forcesIts natural speed is unstable, sometimes fast and sometimes slow. Although this speed and slow error is very small, it accumulates and the error is large.

3 It was later discovered that the sixth shell of the cesium atom, the outermost electron, rotates around the nucleus at a rate of extreme precision, in billions of a second, and is much more stable than the rotation of the earth around its axis. Taking advantage of this characteristic of the cesium atom, people have made a new type of clock - the cesium atomic clock, which stipulates that one second is the time it takes for the cesium atom to "vibrate" 9192601770 times (that is, it is equivalent to the outermost electron of the cesium atom to rotate so many times), which is the latest definition of "second".

4 With the cesium atomic clock, one can measure the time of one billionth of a second with great accuracy, and the total error of time accumulated over 300 years is no more than 5 seconds, far exceeding the accuracy and stability of any other clock in the world that has ever been preceded.

5 With a clock such as the cesium atomic clock, it is possible for mankind to engage in more precise scientific research and production practices.

A clock is not a clock that displays the time on a daily basis, but refers to a clock circuit in a digital system.

Almost all digital systems in the processing of signals are carried out step by step according to the beat, the system is also made according to the beat, the hall to make the circuit of the circuit unified beat needs a "clock signal", the clock signal is the clock circuit.

The core of the clock circuit is a relatively stable oscillator (generally using a crystal oscillator), the oscillator produces a sine wave, and the frequency is not necessarily the clock frequency of the circuit, so the sine wave should be divided, processed, and formed into a clock pulse, and then distributed to the place where it is needed. Used to make all parts of the system work.

Any work is in chronological order. The circuit used to generate this time is the clock circuit. Clock circuits generally consist of crystal oscillators, crystal control chips, and capacitors.

Originally, the time at the Greenwich Observatory was UTC.

However, in early December 1979, the World Administrative Radio Conference, held in Geneva, adopted a resolution establishing the replacement of "Greenwich Mean Time" with "Coordinated Universal Time" as the international standard time in the field of radiocommunications.

Greenwich Mean Time has been known for many years as International Standard Time, so why switch to Coordinated Universal Time? To put it simply, it's because Greenwich Mean Time is not precise enough. Greenwich Mean Time is a time scale based on the Earth's rotation, and because the Earth's spin axis fluctuates from year to year, the time is offset by nearly one second per year.

Therefore, in order to adapt to the development of modern science and technology, there is an urgent need for a more precise international standard time.

Coordinated Universal Time (UTC) is a type of coordinated time in which solar time is constantly corrected according to the Earth's fluctuations relative to its axis, the rate of rotation, and the pole-shift effect. Twice a year, the International Time Bureau makes adjustments and transmits standard time signals around the world via standard time radios, so that the one-second error generated by Greenwich Mean Time can be adjusted.

The beginning of the use of UTC in the radio field will have an important impact on aviation, navigation, synchronous digital communications and astronautics. The adoption of this new International Standard Time marks the rapid development of modern science and technology.

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