Re: [LEAPSECS] leap seconds, newspapers, earth rotation

2021-01-08 Thread Steve Allen
On Wed 2021-01-06T10:36:10-0800 Tom Van Baak hath writ: > Does anyone know who started it? Is there a way to track it down? I am pretty sure that it started when some reporter meandered over to timeanddate.com and then started writing a followup. They have had a running dashboard showing just how

Re: [LEAPSECS] DUT1 about to backtrack

2021-01-08 Thread Michael Deckers via LEAPSECS
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

[LEAPSECS] DUT1 about to backtrack

2021-01-08 Thread John Sauter via LEAPSECS
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,

Re: [LEAPSECS] leap seconds, newspapers, earth rotation

2021-01-08 Thread Steve Summit via LEAPSECS
tvb wrote: > "Atomic clock scientists suggest shortening minute to 59 seconds" > > This is so bad it's funny. A newspaper headline that's inaccurate by > a factor of, just, 100 million. > > By the way, a number of news web sites have been carrying "earth is > speeding up" and "50 years" stories