From: "Tom Van Baak" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] On Setting the Astronomical Time Date: Sun, 10 Jun 2007 12:35:49 -0700 Message-ID: <[EMAIL PROTECTED]>
> > Setting your clock using GPS time, or with the known offset UTC is straight > > forward. Offsetting UTC using the posted value of DUT1 gets you UTC1 good > > to > > 0.1 seconds. But that's 8 orders of magnitude away from the precision of > > UTC. > > Correct. See plots of earth accuracy and stability: > > http://www.leapsecond.com/museum/earth/ > > > Is there some way to get TT to better than a tenth of a second, or is the > > earth > > just too sloppy of a time keeper? > > Don't know for sure but the following may help you: > > http://maia.usno.navy.mil/ > http://www.iers.org/MainDisp.csl?pid=36-9 > http://maia.usno.navy.mil/ser7/finals.daily > http://maia.usno.navy.mil/search/search.html > > My recollection is that using VLBI, UT1 is measured to > sub-millisecond even microsecond levels. > > For example, yesterday UT1-UTC was -148.709 ms, today > it is -149.996 ms, and tomorrow it will be -151.172 ms. Don't you get the IERS emails? Sign up and get them each month. Such a joy reading the latest statistics on how the rock jittered. Cheers, Magnus _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
