[time-nuts] The GPS velocity of light versus neutrinos
magnus at rubidium.dyndns.org
Tue Nov 22 23:57:41 UTC 2011
On 11/22/2011 03:17 PM, Bob Camp wrote:
> On Nov 21, 2011, at 10:57 PM, Jim Lux wrote:
>> On 11/21/11 5:15 PM, Bob Camp wrote:
>>> You can have a surveyor come out and locate your gizmo to sub one inch accuracy for a lot less than a clock trip costs. A one meter ( or 3 ns) error would be pretty large these days. Both have been demonstrated / proven so often that they aren't really open to challenge.
>>> The total error is a sum of lots of things. Location and time of day are the easy stuff...
>>>> OK, So assume an unlikely huge position uncertainly of one meter. On top of
>>>> that let's assume the surveyor got it wrong too and missed by a full
>>>> meter. Both of these added together can only account for about 10%
>>>> of what they saw. Light moves across one meter in about 3nS You
>>>> need to explain 60nS If the result is because of uncertainty in the
>>>> location then the we are talking about 20 meters of position error.
>> in the first paper, the distance uncertainty was given as 20cm
> Of which the survey likely contributed next to nothing and stuff like earth tides contributed the majority of the error ….
Earth tides account for 2-3 dm of rise, not really contributing much to
the 18 m unaccounted for. Also consider that experiment ran for 3 years.
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