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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Time and cel nav, a stupid question
From: Fred Hebard
Date: 2008 Apr 22, 19:07 -0400
From: Fred Hebard
Date: 2008 Apr 22, 19:07 -0400
Dan, The Mac is fine. It's the AT&T cell phone that's slow! Fred On Apr 22, 2008, at 6:52 PM, Dan Allen wrote: > > > 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 > > > > --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
