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The world turns slightly faster and slower on a regular 5.9-year cycle, a new study suggests. Researchers also found small speed changes that happen at the same time as sudden alterations in Earth's magnetic field. The world's rotation speed can change slightly, by up to milliseconds per day, because of shifts in winds or the movement of fluid in Earth's interior. Scientists can measure how fast the Earth spins by observing distant objects in space and timing how long they take to come back into view - that is one day length. [Source: ScienceNews]
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