Radio waves at these low frequencies use the earth and the ionosphere as a wave-guide and follow the curvature of the earth for long distances. This atomic clock regulates the WWVB radio transmitter located in Fort Collins, Colorado, where the exact time signal is continuously broadcast throughout the United States at 60 kHz to take advantage of stable long wave radio paths found in that frequency range. These physicists have created an international standard, measuring a second as 9,192,631,770 vibrations of a Cesium 133 atom in a vacuum. A team of atomic physicists continually measures every second of every day to an accuracy of ten billionths of a second per day. The black Arabic numerals on the white dial give a high contrast whilst facilitating easy readability. Read honest and unbiased product reviews from our users. ![]() ![]() Encased in a circular plastic frame, this wall clock is covered with high-quality glass for optimum protection. Find helpful customer reviews and review ratings for Roger Lascelles Radio Controlled Wall Clock, Red, RC/LASC/RED at. Today, time is precisely measured in the United States by the most accurate clock in North America, the Atomic Clock of the US National Institute of Standards and Technology, Time and Frequency Division in Boulder, Colorado. The Radio Controlled Wall Clock is a simple timepiece synchronized with the radio frequency transmitter in the UK time zone. Since the beginning of time, man has been fascinated with the measurement of time and has devised more accurate machines to trap and measure time. And nothing keeps track of time more precisely and trouble free than our radio controlled clocks.
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