[ntp:questions] National time standard differences

David J Taylor david-taylor at blueyonder.delete-this-bit.and-this-part.co.uk.invalid
Tue Feb 9 15:47:10 UTC 2010

"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?


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