[ntp:questions] National time standard differences

Richard B. Gilbert rgilbert88 at comcast.net
Tue Feb 9 16:49:24 UTC 2010


David J Taylor wrote:
> "Richard B. Gilbert" <rgilbert88 at comcast.net> wrote in message 
> news:NKKdnYaE0NZW5-zWnZ2dnUVZ_uli4p2d at giganews.com...
>> David J Taylor wrote:
> []
>>> Most likely asymmetrical paths, yes.  To answer your implied 
>>> question, it is most /unlikely/ that the USA National Time is 17 
>>> milliseconds away from Japan National Time, if that's what you were 
>>> thinking. National time differences are likely to be microseconds or 
>>> less, I believe.
>>>
>>
>> I believe that the word "less" is appropriate here but might be called 
>> an understatement.  I'd guess that the various national time standards 
>> are within nanoseconds or less.
> 
> Thanks for the update, Terje and Richard.  You must need more digits in 
> the NTP billboard display, then!  <G>
> 
> I remember the flying of caesium or other atomic clocks round the world, 
> and that folks had to invoke relativistic corrections.  Were these 
> better than microseconds as well?
> 

Please excuse me if I leave relativistic corrections to the late 
Professor Einstein!  It's not something I've ever needed to know!




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