length of a regular day.
Earthquakes in 2010 and 2011 -- in Chile and in northeast Japan --
shortened the length of an Earth day fractionally by changing the
distribution of the planet’s mass, in much the same way that a figure
skater speeds up a spin by drawing her arms in closer to her body. Both
quakes caused the Earth to rotate more quickly, trimming a total of 3.06
microseconds off our 24-hour day.
Read More: http://www.wisegeek.com/can-an
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