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International Atomic Time (abbreviated TAI, from its French name temps atomique international [1]) is a high-precision atomic coordinate time standard based on the notional passage of proper time on Earth's geoid. [2] TAI is a weighted average of the time kept by over 450 atomic clocks in over 80 national laboratories worldwide. [3]
This scale allows for time comparisons between different clocks in the laboratory. These atomic time scales are generally referred to as TA(k) for laboratory k. [61] Coordinated Universal Time (UTC) is the result of comparing clocks in national laboratories around the world to International Atomic Time (TAI
18 cesium atomic clocks and 4 hydrogen maser clocks Cs, H National Institute of Information and Communications Technology; Koganei, Japan ... National Standard Time ...
Japan Standard Time (日本標準時, Nihon Hyōjunji, JST), or Japan Central Standard Time (中央標準時, Chūō Hyōjunji, JCST), is the standard time zone in Japan, 9 hours ahead of UTC . [1] Japan does not observe daylight saving time, though its introduction has been debated on several occasions.
[3] [4] BIPM lists the time differences between the UTC timing centers in a monthly publication called Circular T, which contains the most up to date list of contributors to UTC. [ 5 ] When available, links are provided to the relevant "Time Page" displaying the current time as shown from the given service.
A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.
The Kuroshio Current (黒潮, "Black Tide"), also known as the Black Current or Japan Current (日本海流, Nihon Kairyū) is a north-flowing, warm ocean current on the west side of the North Pacific Ocean basin. It was named for the deep blue appearance of its waters.
Both carrier signals contain an identical pulse-width modulated time code and are transmitted 24 hours a day. Low frequency (LF) transmissions are used to enhance accuracy and reduce the possibility of atmospheric interference. The calculated accuracy of JJY's signal is 1×10 −11. Japan Standard Time is set by a caesium atomic clock in Tokyo.