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    Re: Time and cel nav, a stupid question
    From: Dan Allen
    Date: 2008 Apr 22, 16:52 -0600

    
    On 22 Apr 2008, at 4:26 PM, Fred Hebard wrote:
    
    > On a Mac, using time.apple.com.  Just synced, and still about 50
    > seconds slow.
    
    That's very unusual.  I sync lots of Macs to time.apple.com and I am
    never off more than 10 or 20 milliseconds, according to the Mac
    Terminal command
    
         ntpq -c peers
    
    which shows details of NTP servers and times.  I have tweaked my /etc/
    ntp.conf file so that I can query several different servers and NTP
    figures everything out.
    
    Here is a sample output of the ntpq -c peers command on my main Mac:
    
    ---
    
          remote           refid      st t when poll reach   delay
    offset  jitter
    =
    =
    =
    =
    =
    =
    ========================================================================
    *clock.xmission. .GPS.            1 u  614 1024  377   24.369
    -8.786   6.633
    -time1.apple.com 17.106.100.13    2 u   19  256  377   38.468
    -5.278  34.007
    +time-b.nist.gov .ACTS.           1 u  419  256  376   88.355
    8.279  27.296
    +tick.usno.navy. .USNO.           1 u  255  256  377   97.773
    10.332  19.811
    
    ---
    
    It shows four different servers that I am checking in with.  The
    offset column is in ms and shows how far from those servers my machine
    is.  The delay column shows the distance in ms to these servers.  The
    jitter column combines errors in propagation along with absolute time
    errors to come up with an overall error figure, also in ms.
    
    Dan
    
    
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