[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?

Cheers,
David 




More information about the questions mailing list