Re: [LEAPSECS] DUT1 about to backtrack
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. > > > > I think the graph of DUT1 is not quite correct, for instance: > > On 2009-01-01, there was a switch of DUT1 from -0.6 s to +0.4 s > due > to a leap second (Bulletin C36) > On 2009-03-12, there was a switch of DUT1 from +0.4 s to +0.3 s > (Bulletin D102) > Your graph only has one switch, on 2009-01-01 from -0.6 s to +0.3 > s > > Michael Deckers. I have corrected these errors and others with the assistance of Michael Deckers. The updated plot is attached. John Sauter (john_sau...@systemeyescomputerstore.com) -- get my PGP public key with gpg --locate-external-keys john_sau...@systemeyescomputerstore.com DUT1.pdf Description: Adobe PDF document ___ LEAPSECS mailing list LEAPSECS@leapsecond.com https://pairlist6.pair.net/mailman/listinfo/leapsecs
Re: [LEAPSECS] DUT1 about to backtrack
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. > > > > I think the graph of DUT1 is not quite correct, for instance: > > On 2009-01-01, there was a switch of DUT1 from -0.6 s to +0.4 s > due > to a leap second (Bulletin C36) > On 2009-03-12, there was a switch of DUT1 from +0.4 s to +0.3 s > (Bulletin D102) > Your graph only has one switch, on 2009-01-01 from -0.6 s to +0.3 > s > > Michael Deckers. > I was getting the DUT1 values from Bulletin A, but as you point out that is not very accurate. I tried to use Bulletin D, but it omits the change in DUT1 caused by a leap second. To get an accurate chart I will have to combine the information in Bulletin D with a table of leap seconds. Here is the chart based only on Bulletin D. It shows that the current interval of no change in DUT1 is the longest since 1991. John Sauter (john_sau...@systemeyescomputerstore.com) -- get my PGP public key with gpg --locate-external-keys john_sau...@systemeyescomputerstore.com DUT1.pdf Description: Adobe PDF document ___ LEAPSECS mailing list LEAPSECS@leapsecond.com https://pairlist6.pair.net/mailman/listinfo/leapsecs
Re: [LEAPSECS] DUT1 about to backtrack
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. I think the graph of DUT1 is not quite correct, for instance: On 2009-01-01, there was a switch of DUT1 from -0.6 s to +0.4 s due to a leap second (Bulletin C36) On 2009-03-12, there was a switch of DUT1 from +0.4 s to +0.3 s (Bulletin D102) Your graph only has one switch, on 2009-01-01 from -0.6 s to +0.3 s Michael Deckers. ___ LEAPSECS mailing list LEAPSECS@leapsecond.com https://pairlist6.pair.net/mailman/listinfo/leapsecs
