Japan standard time

Standard Time in Japan is legally defined to represent the local time at the th eastern meridian, an arrangement that originated in the Meiji era and dates back as far as [1].

Before the Meiji era — , each local region had its own time zone in which noon was when the sun was exactly at its culmination. As modern transportation methods, such as trains, were adopted, this practice became a source of confusion. For example, there is a difference of about 5 degrees longitude between Tokyo and Osaka and because of this, a train that departed from Tokyo would arrive at Osaka 20 minutes behind the time in Tokyo. In , Ordinance 51 was issued in response to this problem, which stated:. In the ordinance, the first clause mentions GMT, the second defines east longitude and west longitude and the third says the standard time zone would be in effect from Western Standard Time, which was used in Taiwan and some parts of Okinawa , was abolished by Ordinance in and replaced by Central Standard Time in those areas.

Japan standard time

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Youtube NICT channel. The time difference between the cesium atomic clocks and the hydrogen masers installed in the four clock rooms is measured every second. Network Research Institute.

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Tokyo , Kyoto , Osaka , Yokohama. Want to see the time in Japan compared with your home? Choose a date and time then click "Submit" and we'll help you convert it from Japan time to your time zone. Convert Time From Japan to any time zone. Need to compare more than just two places at once? Try our World Meeting Planner and get a color-coded chart comparing the time of day in Japan with all of the other international locations where others will be participating.

Japan standard time

Standard Time in Japan is legally defined to represent the local time at the th eastern meridian, an arrangement that originated in the Meiji era and dates back as far as [1]. Considering that Earth rotates degrees in 24 hours, this means that time in Japan is exactly 9 hours ahead of the time in Greenwich, which used to provide the standard known as Greenwich Mean Time GMT , based on exact astronomical measurements. Today, the international time scale of Coordinated Universal Time UTC is based on precise atomic clocks, but the 9-hour time difference of Japan Standard Time has been maintained. The Japanese Ministry of Internal Affairs and Communications MIC is responsible for providing standard frequencies, transmitting standard radio waves, and reporting standard time [2].

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Retrieved 12 September Before the Meiji era — , each local region had its own time zone in which noon was when the sun was exactly at its culmination. The frequency of these atomic clocks is easily affected by external disturbances such as vibrations, or even slight variations to environmental temperature, humidity, and magnetic field. In , the definition of the second in the SI international system of units was changed to one based on quantum mechanics rather than astronomy. Applied Electromagnetic Research Center. Coordinated Universal Time UTC NICT is then synthesized by an hourly adjustment of the output frequency based on the average over all clocks, calculated from the difference data. Contents move to sidebar hide. Since we interact with time most directly through the change of day and night or the change of seasons, the original units of time were linked to the rotation of the Earth and its motion around the sun. Cesium atomic clocks realize this definition as closely as possible by generating a microwave signal near 9. Data-driven Intelligent System Research Center.

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Each atomic clock is also connected to an uninterruptible power supply unit with a large-capacity rechargable battery in case there is a power outage. A simulation estimated that introducing DST to Japan would increase energy use in Osaka residences by 0. Permanent Researcher. Coordinated Universal Time UTC NICT is then synthesized by an hourly adjustment of the output frequency based on the average over all clocks, calculated from the difference data. The stontium optical lattice clock operates in a similarly controlled environment, and its construction further shields the atoms from outside effects. From the beginning of the atomic time scale, it has been a concern that the difference from astronomical time might become too large, that the day of the TAI scale might drift away from the day determined by the sun. Permanent Research Engineer. Japan mainland and Korea see also Korea Standard Time. In other projects. Greeting from the President. It was synchronized with the Universal Time 2 UT2 , the best previous astronomical time scale, at on January 1,