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

[Alan Melia]

It an awful long time since I did nuclear physics....back then the neutrino
was massless and the standard model didn't exist. There were some "way-out"
models being proposed.....smokey globe!!

A couple of things occur to me....they dont actually measure the time
outgoing of the neutrinos...they infer it.

You can't measure anything with out perturturbing it in some way, even
slightly....then there is the Uncertainly Principle ....if they measure the
speed how do they know where they were.

Ah well (sigh) I suppose far younger brains that mine have taken all this
into account.
I will go back to saving string(s) you never know when it will be useful
:-))

Alan
G3NYK


----- Original Message ----- 
From: "Hal Murray" <hmurray at megapathdsl.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Monday, November 21, 2011 9:06 PM
Subject: Re: [time-nuts] The GPS velocity of light versus neutrinos


>
> > Has anyone measured the speed of light with GPS clocks in the same way
that
> > neutrinos are measured - say between mountain tops?
>
> I'm pretty sure that won't work very well.  The problem is that air isn't
> vacuum.  The index of refraction changes slightly with temperature.
>
> The subtle changes in the index of refraction are what causes mirages.
>
>
> The San Andreas fault (and friends) runs right down the middle of Silicon
> Valley.  The USGS has a big research group here.  There are two convenient
> mountains.
>
> They used to do laser ranging between the mountain tops to track the fault
> motions.  In order to get good data, they had to run a helicopter along
the
> beam to measure the air temperature.  (Maybe they also measured other
things
> like humidity.  ??)  I don't remember where I heard that story.  It was a
> long time ago.
>
> These days, the USGS uses GPS.  They don't need mountain tops.  It's not
> uncommon to see them slightly off a highway.
>
> Maybe I'll remember to ask more at their next open house.
>
> For anybody in the area...  The next open house in Menlo Park is May
19+20,
> 2012.
>   http://openhouse.wr.usgs.gov/2012/index.html
> They have them every 3 years.  Kids welcome.  I always have fun.
>
>
> -- 
> These are my opinions, not necessarily my employer's.  I hate spam.
>
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.