On 11/29/15 12:13 PM, Mark Sims wrote:
Another thing to consider is the gravity anomaly caused by that hunk of granite
beneath your clock (or above it in a mine). Hmmm, what is the clock shift at
the top of Mt Everest that is due to the mountain and not the altitude?
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t
when going deep..
the Homestake mine in South Dakota is something like 2500m (8000 ft)
deep. There's a DoE funded research facility somewhere deep for nuclear
experiments. There could well be atomic clocks already down there.
https://en.wikipedia.org/wiki/Sanford_Underground_Research_Facility
https://en.wikipedia.org/wiki/Large_Underground_Xenon_experiment is
about halfway down (I think the lower part of the mine is still flooded)
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