Word: lag
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Dates: during 1930-1930
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...astronomers at first concluded that the moon was off schedule but subsequent checks on other bodies proved earth to be at fault. Gratifying to clock manufacturers was his statement that the slight variation has some method. Earth would, said Dr. Brown, run fast for a number of years, then lag behind. Sudden changes in rotation rate were noted in 1897 and 1917. Causes for such behavior are unknown...