[time-nuts] On Setting the Astronomical Time
Tom Van Baak
tvb at LeapSecond.com
Sun Jun 10 15:35:49 EDT 2007
> 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:
> 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:
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.
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