On Mon, Mar 19, 2018 at 2:02 PM, Gary E. Miller <g...@rellim.com> wrote:
> Yo Hal! > > On Mon, 19 Mar 2018 12:41:46 -0700 > Hal Murray <hmur...@megapathdsl.net> wrote: > > > Perhaps we should setup a simple UDP server that responds with the > > UT1-UTC offset. The idea is that you can get a good UTC via GPS or > > good local NTP servers. > > How about the client just downloads the daily UT1 to UTC correction > data, then adjusts UTC(GPS)? > > http://maia.usno.navy.mil/ser7/ser7.dat > > Here is a sample of this week's report: > > IERS Rapid Service > MJD x error y error UT1-UTC error > " " " " s s > 18 3 9 58186 0.00803 .00009 0.36036 .00009 0.157823 0.000011 > 18 3 10 58187 0.00857 .00009 0.36159 .00009 0.157100 0.000006 > 18 3 11 58188 0.00974 .00009 0.36269 .00009 0.156399 0.000004 > 18 3 12 58189 0.01137 .00009 0.36401 .00009 0.155694 0.000003 > 18 3 13 58190 0.01283 .00009 0.36560 .00009 0.154949 0.000065 > 18 3 14 58191 0.01385 .00009 0.36737 .00009 0.154118 0.000065 > 18 3 15 58192 0.01450 .00009 0.36927 .00009 0.153196 0.000055 > > Looks to me about a kinda sort maybe 1 micro second per day shift. > Should be closer to 1ms/day. And it is: the above is 4.6ms in 6 days or 770us/day. Warner
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