[time-nuts] The GPS velocity of light versus neutrinos

Bob Camp lists at rtty.us
Tue Nov 22 09:17:53 EST 2011


On Nov 21, 2011, at 10:57 PM, Jim Lux wrote:

> On 11/21/11 5:15 PM, Bob Camp wrote:
>> Hi
>> 
>> 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 ….

> 
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