In most cases, the displayed time is correct to within an uncertainty equal to the network delay. The network delay can be used to estimate the uncertainties in the displayed official time and the clock offset. The network delay is equal to one half the period of time it takes for a roundtrip exchange of messages between your device and NRC's atomic clocks. You can adjust your device's clock manually, or have it set automatically through the use of Network Time Protocol (NTP). thousands of seconds), check that your computer settings for the date, time zone, or daylight saving time are correct. The offset of the clock in your device from NRC official time is also shown ('Your local clock is _ seconds fast / slow'). For more information on Canadian time zones consult Time zones & daylight saving time. If you are outside North America, the display will show UTC (Coordinated Universal Time – the modern implementation of Zulu time or GMT). If you are in North America, the display will usually show time according to your time zone. The time displayed is corrected for measured network delays. Your computer or mobile device receives the official time through a periodic exchange of time-stamped messages between your device and NRC's time source. The time displayed on your screen is derived from Canada's official time source: NRC's atomic clocks. On average, Earth has been slowing down a bit over the past decades, so UTC is currently running 37 seconds behind TAI.How is the official time displayed on my screen? Before the difference between the two scales reaches 0.9 seconds, a leap second is added to UTC. For this reason, UTC is constantly compared to UT1. On the other hand, TAI does not take into account the variations in Earth's rotation speed, which determines the true length of a day. On the one hand, accurate time-keeping is a necessity, for example for time-sensitive technology, such as modern air traffic control systems that rely on satellite navigation. The high level of precision achieved by using atomic clocks is both a blessing and a curse. The time scale is weighted, prioritizing the time signal provided by institutions that maintain the highest quality of primary cesium. To achieve the highest possible level of accuracy, the International Bureau of Weights and Measures combines the output of about 400 atomic clocks in 69 national laboratories worldwide to determine TAI. If TAI is so precise, why use leap seconds? If one could see an atomic fountain, it would resemble a water fountain. The International System of Units (SI) defines one second as the time it takes a Cesium-133 atom at the ground state to oscillate exactly 9,192,631,770 times.Ītomic clocks are designed to detect this frequency, most of them today using atomic fountains a cloud of atoms that is tossed upwards by lasers in the Earth's gravitational field. The secret to this impeccable precision is the correct measurement of the second as the base unit of modern time-keeping. Atomic clocks deviate only 1 second in up to 100 million years. International Atomic Time is an extraordinarily precise means of time-keeping. It is used to compare the pace provided by TAI with the actual length of a day on Earth. Universal Time (UT1), also known as astronomical time, refers to the Earth's rotation. It provides the exact speed at which our clocks tick. International Atomic Time (TAI) is a time scale that uses the combined output of some 400 highly precise atomic clocks.Two components are used to determine Coordinated Universal Time (UTC): Business Date to Date (exclude holidays).
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