[tz] [PROPOSED 2/2] Cite Tom Scott on Danish time

Tim Parenti tim at timtimeonline.com
Sun Oct 18 00:16:23 UTC 2020

Oof.  This citation is perhaps more complicated than it might seem.

When the video was published on 2019-02-18, its title at launch was
originally "Why Denmark Is .07 Seconds Behind The World".  From 4:45 in
that video: "I've written some code that will keep checking the clocks and
automatically update the title of this video as we go. At least until the
code breaks and I can't be bothered to fix it anymore."  Clever.  Searching
Twitter and Reddit, you can even pick out the folks who were a week or so
late to the party, sharing a cool video called "Why Denmark Is .08 Seconds
Behind The World".  ;)

He states UT1-UTC is -0.04s "as [he] record[s] this" (which aligns with
contemporaneous estimates for January 2019) and would be -0.06s "[b]y the
time this video goes live."  Predictions at the time were indeed that the
difference would grow to -0.25s by the end of 2019, but it seems
the earth's rotation sped up a bit in the meantime, so it didn't end up
hitting that value until ~June 2020,…shortly after which the difference
even began advancing back toward the positive direction, as it's still
doing according to the latest tables.  IERS Bulletin D, which announces the
(rounded/approximated) value of DUT1 to be disseminated with time signals,
hasn't been issued since April 2019, when normally an update is issued
every few months.  That value, as disseminated, has remained steady at
-0.2s since 2019-05-02.

Tim Parenti

On Fri, 16 Oct 2020 at 22:13, Paul Eggert <eggert at cs.ucla.edu> wrote:

> * tz-art.html (Documentaries): Add "Why Denmark is .17 Seconds
> Behind The World" (thanks to Jim Eggert).
> ---
>  tz-art.html | 4 ++++
>  1 file changed, 4 insertions(+)
> diff --git a/tz-art.html b/tz-art.html
> index 5de546a..72b9654 100644
> --- a/tz-art.html
> +++ b/tz-art.html
> @@ -22,6 +22,10 @@ into problems that programmers have with
> timekeeping.</li>
>  Explaining The Mysteries Of Time Zones</a>" (2017; 2:15)
>  briefly says why France has more time zones than Russia.
>  <li>
> +"<a href="https://www.youtube.com/watch?v=yRz-Dl60Lfc">Why Denmark is
> +.17 Seconds Behind The World</a>" (2019; 6:29) explains why Denmark and
> +the United Kingdom don't exactly follow their own law about civil time.
> +<li>
>  "About Time" (1962; 59 minutes) is part of the
>  Bell Science extravaganza, with Frank Baxter, Richard Deacon, and Les
> Tremayne.
>  Its advisor was Richard Feynman, and it was voiced by Mel Blanc.
> --
> 2.25.1
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