[time-nuts] NIST UT1 NTP server results

Tom Van Baak tvb at LeapSecond.com
Fri Jul 22 18:14:26 EDT 2016

Hi Mike,

A direct reply from Judah to the list:

> Hello,
>      Following a discussion with Felicitas Arias and a number of others,
> I have removed the registration requirement for the ut1 time server. It
> is now open access. Enjoy. Note the usual limitation -- no more than 3
> requests in any 5 second period from any single ip address.
>       The current algorithm on the server uses the UT1 offset from
> Circular A with no interpolation. The value changes at 0 UTC every day.
> I did not use any interpolation because the difference in the dUT1
> value  from one day to the next is on the order of 1-2 ms, and I
> considered that it was likely that the jitter and asymmetry of the
> network connection to a typical user would limit the accuracy to a
> larger value anyway so that interpolation would not actually improve
> anything. However, I will certainly consider changing this. It would not
> be a big deal to add interpolation if there were some good reason for
> doing so.
> Best wishes,
> Judah Levine


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