Actually you get exact time from your GPS 8 times each day. One of the consequences of Relativity is that the faster you go, the slower time progresses for your frame of reference. (Hence "relativity".
The GPS satellites are 27000 miles up in geosyncronus orbit, and trasveling about 18000MPH faster than the spot just below them on earth. The clocks on the satellites lose several seconds each day relative to the spot b elow them on the surface. There is an Air Force facility out west (Nebraska, I think) that adjusts the clocks on the satellite 8 times a day to bring them back in line with UTC. There was a segment on a NOVA episode about the GPS system and how it worked, and they mentioned that one time, when the USAF could not make the adjustment because of a software or equipment problem, that the average error of a GPS system using the US satellites got up to 8 miles -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Wally Bryant Sent: Sunday, January 27, 2013 8:25 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List Sextant You can always get accurate time from your GPS... (sorry, I couldn't help myself.) Wal _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
