The time service system is a working system for determining and transmitting precise moments. At every hour, the radio that is listening to the radio will broadcast a "beep, beep ..." sound. People use it to proofread their own clocks. Where did the correct time come from on the radio station? It is controlled by the Observatory's precision clock. Then how did the Observatory know these precise times? We know that the Earth rotates once a day, so the stars in the sky rise once a day. If you think of the earth as a big clock. The stars in the sky are like the numbers on the clock. The position of the stars is well measured by astronomers, which means that the number of clocks on this natural clock is precisely known. Astronomers' telescopes are like pointers on a clock. In our everyday clocks, the pointer moves to the clock face. Here it looks like the pointer is “not moving†and the “clock face†is turning. When the stars are aligned with the telescope, astronomers know the correct time and use this time to correct the clock of the Observatory. This way astronomers can always know the correct time from the clock face of the Observatory. Then at a certain time every day, for example, on the hour, radio broadcast out, we can go to proofread their own watches, or for other work needs.
Astronomical time-measurement depends on the rotation of the earth, and the inhomogeneity of the earth's rotation makes the time (world time) accuracy obtained by the astronomical method only reach 10-9, which can not meet the needs of various aspects of the socio-economic in the middle of the 20th century. A more accurate and stable time standard emerged. This is the "atomic clock." At present, all countries in the world use atomic clocks to generate and maintain standard time. This is the “time baseâ€. Then, time signals are delivered to users through various means and media, including: shortwave, longwave, telephone network, internet, satellite, etc. . This entire process is called "time service system."
Astronomical time-measurement depends on the rotation of the earth, and the inhomogeneity of the earth's rotation makes the time (world time) accuracy obtained by the astronomical method only reach 10-9, which can not meet the needs of various aspects of the socio-economic in the middle of the 20th century. A more accurate and stable time standard emerged. This is the "atomic clock." At present, all countries in the world use atomic clocks to generate and maintain standard time. This is the “time baseâ€. Then, time signals are delivered to users through various means and media, including: shortwave, longwave, telephone network, internet, satellite, etc. . This entire process is called "time service system."
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