[ntp:questions] USNO Clock Fast?
Richard B. Gilbert
rgilbert88 at comcast.net
Mon Nov 6 20:56:37 UTC 2006
Daniel Norton wrote:
> Why does USNO show several seconds faster than time.gov (and other
It is not, now, off by "several seconds". I'm inclined to doubt that it
ever was! I think you are misinterpreting something. Perhaps you are
reading milliseconds as seconds?
From here, tick.usno.navy.mil is within 898 microseconds of my own
stratum 1 (GPS reference clock) server which is amazingly good. Usually
internet servers are off by anywhere from two to ten milliseconds! Note
that the servers themselves are within a few microseconds or even a few
nanoseconds of the correct time but asymmetric network delays usually
introduce an offset of several milliseconds.
FWIW, the "offset" in the ntpq -p banner is in milliseconds!
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