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

[Donald E. Pauly]

All spring scales (not balance scales) are affected by the gravity of
the sun.  This includes virtually all digital scales these days. If
memory serves, all spring scales read high by 1 part per thousand at
midnight and low by 1 part per thousand at noon.  The effect on blue
shift is proportional.  Again if memory serves blue shift from GPS is
66 parts per trillion.  The noon midnight shift is 1,000 times less or
66e-15.  I don't have time to calculate these and the exact figures
are left to the student as an exercise.  Buy gold at noon and sell at
midnight.  You make almost $4 per ounce.  Most dealers use digital
spring scales.

Do not confuse solar tidal effects with the above.  Again if memory
serves, the sun has one-third of the tidal effect of the moon.


On Wed, Feb 1, 2023 at 1:49 PM Demetrios Matsakis via time-nuts
<time-nuts at lists.febo.com> wrote:
>
> 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)
> > UCO/Lick Observatory--ISB 260  Natural Sciences II, Room 165  Lat  +36.99855
> > 1156 High Street               Voice: +1 831 459 3046         Lng -122.06015
> > Santa Cruz, CA 95064           https://www.ucolick.org/~sla/  Hgt +250 m
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