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El Nino said to be lengthening the day, but not for long

...scientifically," Gipson said. It would matter, though, to space travelers. Spacecraft such as the Mars Pathfinder use tracking devices on Earth to orient and navigate themselves in space, said Byron D. Tapley, a University of Texas researcher...

http://chronicle.augusta.com/stories/1998/05/28/tec_229702.shtml
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