According to the IERS, today, for the first time since the
establishment of the modern definition of UTC in 1973, the quantity
UT1-UTC crosses zero while increasing. If this continues we will have
a negative leap second, probably some time in the 2030s.
I hope everyone noticed that the IERS issued Bulletin D 142 today,
which raises DUT1 from -0.1 to 0 as of July 28. I attach the bulletin
and my chart of values of DUT1. I predict a negative leap second
around the end of this decade.
John Sauter (john_sau...@systemeyescomputerstore.com)
--
On Thu, 2022-05-05 at 20:05 +0100, Tony Finch wrote:
> John Sauter via LEAPSECS wrote:
> >
> > One of the links on that page is to the draft of the resolutions
> > for
> > the 27th CGPM meeting, in November 2022. Resolution D notes that
> > "recent observat
On Tue, 2022-05-03 at 14:20 -0700, Steve Allen wrote:
> Orolia has a 17 minute podcast about leap seconds
>
> https://www.orolia.com/place-and-time-episode-3-the-leap-second-on-trial/
>
One of the links on that page is to the draft of the resolutions for
the 27th CGPM meeting, in November 2022.
On Fri, 2021-01-08 at 22:51 +, Michael Deckers wrote:
>
> On 2021-01-08 19:57, John Sauter via LEAPSECS wrote:
>
> > I attach a plot of historical values of DUT1 based on the old
> > issues of
> > Bulletin A kept on the IERS' web site.
>
>
>
>
On Fri, 2021-01-08 at 22:51 +, Michael Deckers wrote:
>
> On 2021-01-08 19:57, John Sauter via LEAPSECS wrote:
>
> > I attach a plot of historical values of DUT1 based on the old
> > issues of
> > Bulletin A kept on the IERS' web site.
>
>
>
>
The IERS specifies in Bulletin A the value for DUT1, which is an
approximation of UT1-UTC that is transmitted with time signals. The
current value is -0.2, which has not changed since May of 2019, an
unusually long time.
If the IERS prediction of future values of UT1-UTC turns out to be
correct,
On Wed, 2021-01-06 at 10:36 -0800, Tom Van Baak wrote:
> "Atomic clock scientists suggest shortening minute to 59 seconds"
>
> This is so bad it's funny. [1] A newspaper headline that's inaccurate
> by
> a factor of, just, 100 million.
>
> Why? If time had 59 minutes per hour instead of 60 the
The November 19, 2020 IERS Bulletin A (volume XXXIII number 047) has
this line:
UT1-UTC = -0.1728 + 0.1 (MJD - 59180) - (UT2-UT1)
Taking this prediction of UT2 literally, it suggests that the next leap
second will be on June 30, 2246, and it will be negative.
I believe there will be several years between the the last leap second
and the next, as there was between December 31, 1998 and December 31,
2005. The IERS publishes a long-term prediction of the average
rotation rate of the Earth, which they update in their Bulletin A each
week. The August 6,
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