Przemek Klosowski wrote: > On Tue, Nov 23, 2010 at 1:14 PM, Jon Elson <el...@pico-systems.com> wrote: > > >> The GPS system has atomic clocks accurate to some insane level like one >> second in 10,000 years. They have to periodically adjust the clocks for >> relativistic >> effects. >> > > NIST runs the master clocks for the system from Boulder, and keeps > improving them. The most recent generation uses single Aluminum ion, > and is accurate to 1s in over 3 billion years. Right, and the clocks on board the GPS satellites are periodically reset from the NIST master clocks. The time standards carried on board the satellites are not this accurate, but are still Rubidium atomic clocks, and WAYYY more accurate than anything us mere mortals can afford. At least, that is the way the system used to be set up, there might have been updates since.
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