National Institute of Standards and Technology | NIST
Find the current time in different U.S. time zones and territories, including Alaska, Hawaii, Puerto Rico, and Samoa. NIST is the national authority for time and frequency standards in the U.S.
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NIST US Time Widget
Get the official US time across devices with the NIST HTML5 cross-platform time …
HTML5 for Cross-Platform D…
The Official NIST US Time Widget is an HTML5 cross-platform tool that displays …
Time.is - exact time, any time zone
3 天之前 · Time.is displays exact, official atomic clock time for any time zone (more than 7 million locations) in 57 languages.
Current International Atomic Time, Time Standard (TAI) …
2 天之前 · TAI is a highly precise time scale based on atomic clocks around the world. It is the basis for UTC and does not observe DST. See current TAI and its offset from UTC/GMT.
What Is International Atomic Time (TAI)? - timeanddate.com
TAI is a time scale based on the combined output of about 400 atomic clocks that provides the exact speed of our clocks. It is one of the components of UTC, which a…
International Atomic Time - Wikipedia
International Atomic Time (abbreviated TAI, from its French name temps atomique international ) is a high-precision atomic coordinate time standard based on the notional passage of proper time on Earth's geoid. TAI is a weighted average of the time kept by over 450 atomic clocks in over 80 national laboratories worldwide. It is a continuous scale of time, without leap seconds, and it is the principal realisation of Terrestrial Time (with a fixed offset of epoch). It is the basis for Coordinated Universal Time
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国际原子时 - 百度百科
国际原子时（TAI）：针对某些元素的原子能级跃迁频率有极高的稳定性，可采用基于铯原子（Cs 132.9）的能级跃迁原子秒作为时标。. TAI是1971年由国际时间局建立，现改为国际计量局（BIPM）的时间部门在维持，根据全球约60个实 …
國際原子時 - 维基百科，自由的百科全书
国际原子时（英語： International Atomic Time 、法語： Temps Atomique International, TAI [1] ）是根据以下秒的定义的一种国际参照时标， 属于国际单位制。 1967年第13届 國際度量衡大 …
Atomic Time | Accuracy, Measurement, Clocks
Learn about atomic time, the timescale generated by atomic clocks that is more accurate than astronomical means. Find out how International Atomic Time (TAI) and Coordinated Universal Time (UTC) are derived from atomic …
A Brief History of Atomic Time | NIST
2024年8月20日 · Learn how scientists developed the atomic clock, a device that uses the oscillations of atoms to measure time with unprecedented accuracy and precision. …
How Do Atomic Clocks Work? - NIST
2024年8月22日 · Learn how atoms produce stable and precise ticks of time using light waves tuned to their resonant frequencies. Explore the history, science and applications of …
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