Later in 1955, Dr. Charles h. Townes at Columbia University, the United States, reached Friday, the clock is called ammonia maser. The type of this clock can only run wrong 1 seconds in two centuries. At the Massachusetts Institute of technology, Dr. Jerrold r. Zacharias was successful about the atomic clock used the substance Cesium (cesium atomic clock). Dr. Zacharias has calculated that if this clock running things from the time of Christ to the present day, it will fast or slow .5 seconds.
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