Re: [LEAPSECS] PT Barnum was right

From: John Cowan <>
Date: Thu, 6 Jul 2006 13:46:21 -0400

Rob Seaman scripsit:

> Most troubling would be if two moving platforms are depending on GPS
> units with differing delays, e.g., two airplanes following neighboring
> flight paths. How far does an airplane move in 2 seconds? What is
> the minimum separation required by the FAA?

Jetliners travel at about 550 mi/hr, or 246 m/s. Required horizontal
separation depends on circumstances, but is rarely less than 3 miles =
4828 m. So if the discrepancy is 2 s, there is a safety factor of
about an order of magnitude. Good enough.

So that's the tune they play on                 John Cowan
their fascist banjos, is it?          
        --Great-Souled Sam            
Received on Thu Jul 06 2006 - 10:51:26 PDT

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