Japan Earthquake Made the Day Shorter 4 comments
The enormous tsunami-spawning earthquake off Japan Friday not only shifted the planet’s axis by several inches, it also sped up the Earth’s rotation, shortening each day by 1.8 microseconds. Richard Gross, man who calculates these changes at NASA’s Jet Propulsion Lab, tells PM how he does it—and why those millionths of a second matter. Read more Read more
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