[time-nuts] Re: gravity fields affect time keeping?

[Demetrios Matsakis]

There have been papers published about why there is no noon/midnight effect, and some dispute by the theorists about the proper explanation for the lack of it.

I can point you to N. Ashby and M. Weiss, 2013, “Why there is no noon-midnight shift in the GPS”, http://arXiv [gr-qc]:1307.6525,https://arxiv.org/abs/1307.6525   These authors, as brilliant as the ones they disagree with, state that past arguments appealing to the second-order doppler shift being cancelled by the gravitational gradient miss the fundamental ideas behind the principle of simultaneity.

> On Jan 31, 2023, at 12:06 PM, Steve Allen via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> On Tue 2023-01-31T15:34:16+0100 Marek Doršic via time-nuts hath writ:
>> Anybody studied the influence of the Sun's gravity on clocks in GNSS satellites?
>> The field might change slightly by 40,000 km distance when the sat
>> is closer to the Sun than later on the opossite side of Earth.  Is
>> this measurable on the clocks?
> 
> IAU 2000 resolutions B1.3 and B1.5 codify the understanding of the
> spacetime transformations from the potentials and metric.
> 
> https://www.iau.org/static/resolutions/IAU2000_French.pdf
> 
> This particular effect is small, and I am not sure that the GPS clocks
> are stable enough to reveal it.
> 
> --
> Steve Allen                    <sla at ucolick.org>              WGS-84 (GPS)
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