Quote:
Originally Posted by Ernest Wilson
Originally Posted by CraigS http://www.iceinspace.com.au/vbiis/i...s/viewpost.gif
This is news to me .. can you elaborate on the 'instances' (and thus circumstances), where GR or SR don't 'work' ?
The GPS is designed on Lorentzian Relativity and not GR or SR. See reference below:
Apeiron
, Vol. 10, No. 1, January 2003 69
© 2003 C. Roy Keys Inc.
What the Global Positioning
System Tells Us about the
Twin’s Paradox
Tom Van Flandern Meta Research tomvf@metaresearch.org
Ernie
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I understand that the clocks used in the GPS satellites are periodically corrected to compensate for the effects of Gravitational time dilation of the clocks in orbit, when compared with ground clocks … using GR to calculate the correction factors.
Relativity in the Global Positioning System, Neil Ashby, 2003 (revised 2007).
Also from Wiki:
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Although the Global Positioning System (GPS) is not designed as a test of fundamental physics, it must account for the gravitational redshift in its timing system, and physicists have analyzed timing data from the GPS to confirm other tests. When the first satellite was launched, some engineers resisted the prediction that a noticeable gravitational time dilation would occur, so the first satellite was launched without the clock adjustment that was later built into subsequent satellites. It showed the predicted shift of 38 microseconds per day. This rate of discrepancy is sufficient to substantially impair function of GPS within hours if not accounted for.
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Cheers