[time-nuts] GENIUS by Stephen Hawking (PBS TV), with 5071A cesium clocks

[Bob Stewart]

If you're using someone else's clock (e.g. GPS time) then it doesn't matter what's happening to you, you'll only know what you see on that clock.  But, if you have your own clock (e.g. an HP 5071A) on your person, and can compare it to someone else's clock, then assuming both clocks are accurate enough, you can see any difference in the rate of time you are experiencing vs the other person.

Bob
--------------------------------------------
On Fri, 5/20/16, Peter Reilley <preilley_454 at comcast.net> wrote:

 Subject: Re: [time-nuts] GENIUS by Stephen Hawking (PBS TV), with 5071A cesium clocks
 To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
 Date: Friday, May 20, 2016, 10:24 AM
 
 I have a
 question.   I, of small brain, am wondering: if
 the time 
 difference between the
 top of the mountain and the bottom of the
 mountain is 20 nS over 24 
 hours could
 you
 repeat the same experiment using GPS? 
   The time difference of 20 nS is 
 measurable
 using GPS.
 
 The GPS clock must run faster
 on the mountain top than the GPS at the 
 mountain
 base and yet the two
 remain synchronized to the satellite
 reference.   
 Therefore
 the GPS 1 PPS signal (measurable to a few nS)
 must be wrong in in one of 
 the local
 frame references.
 
 My brain hurts.
 
 Pete.
 
 
 On 5/20/2016 10:16 AM, Bob Camp wrote:
 > Hi
 >
 > Ok, so *that* link got me to the episode.
 Very impressive stuff. Well done !!!
 >
 > Bob
 >
 >
 >> On May 20, 2016,
 at 2:04 AM, Tom Van Baak <tvb at LeapSecond.com>
 wrote:
 >>
 >> For
 those of you who missed the live TV broadcast, I'm told
 PBS has a live stream:
 >> http://www.pbs.org/video/2365757267/
 >>
 >> The cesium
 clock parts are in the last 15 minutes of the show.
 >> I also added more photos/plots to:
 >> http://leapsecond.com/great2016a/photos.htm
 >>
 >> /tvb
 >>
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