[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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