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The National Research Council (NRC) maintains Canada's official time through the use of atomic clocks. [3] The official time is specified in legislation passed by the individual provinces. In Quebec it is based on coordinated universal time. [4] The other provinces use mean solar time.
In addition to increased accuracy, the development of chip-scale atomic clocks has expanded the number of places atomic clocks can be used. In August 2004, NIST scientists demonstrated a chip-scale atomic clock that was 100 times smaller than an ordinary atomic clock and had a much smaller power consumption of 125 mW .
Continuous transmission at 90 metres began at the end of 1929, with other wavelengths being used experimentally. Time signals were generated from the observatory's own pendulum clocks. The transmitter oscillators were condenser-tuned and so frequency stability was not high until quartz crystal control was implemented in 1933.
In atomic clocks, an atom’s electrons are pinged with electromagnetic radiation at specific frequencies. Bursts of energy excite the electrons, pushing them into a higher orbit around the atom.
This page was last edited on 6 December 2024, at 01:21 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
TAI is a weighted average of the time kept by over 450 atomic clocks in over 80 national laboratories worldwide. [3] The majority of the clocks involved are caesium clocks; the International System of Units (SI) definition of the second is based on caesium. [6] The clocks are compared using GPS signals and two-way satellite time and frequency ...
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