XPost: rec.arts.tv, alt.fan.rush-limbaugh
From: nospam@de-ster.demon.nl
Paul.B.Andersen wrote:
> Den 31.10.2025 13:21, skrev Maciej Wo?niak:
> >
> > GPS clocks are adjusted down by (1 - 4.4647e-10)
> > so the adjusted clock will measure a mean solar day
> > to last 86400 s, and the clock will stay in sync with UTC.
>
> Right.
>
> >
> > I.e. where The Shit is predicting the measurement
> > result of 86400s+37(afair)us, the real measurement
> > result is 86400, with the precision of an acceptable
> > error. Common sense has been warning your idiot guru.
>
> Lets take this one step at the time:
>
> 1. A clock on the ground which is running according to
> the SI definition will measure a mean solar day to
> last 86400 s.
>
> 2. SR predicts that a clock in GPS orbit which is running
> according to the SI definition will measure a mean solar
> day to last 86400?(1 + 4.4647e-10) s ≈ 86400s + 38.6 ?s
>
> 3. When a clock in GPS orbit is adjusted to run slow
> by the factor (1 - 4.4647e-10) compared to the SI-definition,
> then the clock will measure a mean solar day to last 86400 s.
>
> Please explain why the real measurement in 3.
> do not confirm SR's prediction in 2.
You shouldn't allow yourself to be dragged
into this 'mean solar day' nonsense.
There is no way that a 'mean solar day' can be measured
to anything like the accuracy of an atomic clock.
That is precisely the reason why the astronomical definition of the
second was given up, long ago.
So the 'mean solar day' is by definition nothing but
86400 SI seconds. (of proper time)
And of course 86401 seconds, once in every three years or so.
The 'mean' can be left off.
What is really mesured these days
is the actual orientation in space of the Earth.
We have the IERS to keep track of that,
nearly instantaneously, to centimeter accuracy.
Jan
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