Japan’s Earthquake Causes Day to Get a Tiny Bit Shorter

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The rotation has changed ever so slightly.

You won’t notice it, but the day just got a tiny bit shorter because of Friday’s giant earthquake off the coast of Japan.

NASA geophysicist Richard Gross calculated that Earth’s rotation sped up by 1.8 microseconds. That’s because of the shift in Earth’s mass caused by the 8.9-magnitude earthquake. A microsecond is one-millionth of a second.

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