Why might scientists need to adjust atomic clocks by adding or removing a leap second?
Answer
To keep them synchronized with subtle changes in the rate of Earth's rotation
Changes in the Earth's rotational speed, often caused by mass redistribution like melting ice, require adjustments to highly accurate timekeeping systems, sometimes involving the addition or removal of a leap second.
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The Earth Is Wobbling: The Precession of the Equinoxes - YouTube
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