Re: GPS calculations

From: Tom Roberts (tjroberts_at_lucent.com)
Date: 09/30/04 

Date: Thu, 30 Sep 2004 08:51:27 -0500

Henri Wilson wrote:
> On Wed, 29 Sep 2004 22:55:55 +0200, "Paul B. Andersen" <paul.b.andersen@hia.no>
> wrote:
>>But since GR is capable of predicting how to adjust the rate of the clock
>>before it is launched, we do not have to adjust the clock in orbit.
>>And - as we know - GR got it exactly right for the GPS satellite clocks.
>
> GR got it wrong by at least 20%

Why do you keep repeating this falsehood????

GR got the relationship between GPS satellite clocks and ground clocks
right to an accuracy of at least 0.1%. That's about as good as one can
expect, because small effects ignored in a GR analysis are that large
(effects of sun, moon, orbital errors, ...).

> In fact the 'free fall' error has never been properly measured

Hmmm. The GPS satellite clocks have been measured probably millions of
times and compared to ground clocks.

Tom Roberts tjroberts@lucent.com

Relevant Pages

  • Re: BBC havent put their clocks back yet!
    ... > that includes clocks of different types, some of which have to be ... 'business partners') but the designers / accountants of the said ... equipment for not designing their clocks to be manually adjustable, ... either incapable or too dammed lazy to check and adjust their own ...
    (uk.tech.broadcast)
  • Re: Clocks auto-adjust after time change
    ... As far as I know, the only things that can cause this are the daylight saving check box (you want to set it to automatically adjust), or the incorrect time zone. ... server, the time would be correct on each, because the time zone setting would compensate on the one at -6. ... After the time change for daylight savings most of the clocks adjusted ...
    (microsoft.public.windows.server.sbs)
  • Re: Clocks auto-adjust after time change
    ... saving check box (you want to set it to automatically adjust), ... patches for daylight saving time issues. ... so if you had a workstation and a server at ... After the time change for daylight savings most of the clocks adjusted ...
    (microsoft.public.windows.server.sbs)
  • Re: Why SR? (was: Source Independency of Light Speed Without an Aether???????)
    ... signals that by definition travel at isotropic c then there is no way ... given frame in order to sync clocks with some other frame ... clocks on the embankment. ... you adjust your watch to agree with those around you. ...
    (sci.physics.relativity)
  • Re: G.M.T. Thursday 25th October 2007
    ... extra hour just to adjust all their clocks, watches and timers. ...
    (uk.people.silversurfers)