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* Re: [COFF] What does your "cal" show? (fwd)
@ 2021-09-09  1:22 Dave Horsfall
  2021-09-09  1:34 ` Adam Thornton
  0 siblings, 1 reply; 3+ messages in thread
From: Dave Horsfall @ 2021-09-09  1:22 UTC (permalink / raw)
  To: Computer Old Farts Followers

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> Ah, leap seconds.  I work for an observatory.  Some things are in TAI 
> and some are in UTC.  At least now I know what to look for when 
> something is 37 seconds off.

Isn't about that the transit of the Moon or something?

-- Dave

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* Re: [COFF] What does your "cal" show? (fwd)
  2021-09-09  1:22 [COFF] What does your "cal" show? (fwd) Dave Horsfall
@ 2021-09-09  1:34 ` Adam Thornton
  2021-09-09  1:47   ` Warner Losh
  0 siblings, 1 reply; 3+ messages in thread
From: Adam Thornton @ 2021-09-09  1:34 UTC (permalink / raw)
  To: Dave Horsfall; +Cc: Computer Old Farts Followers


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Just variation of Earth’s rotational speed over time, AFAIK.

http://leapsecond.com/java/gpsclock.htm -- TAI is SI second ticks, UTC is
corrected to rotation by leap seconds.  Currently they are 37 seconds apart.

Adam

On Sep 8, 2021, at 6:22 PM, Dave Horsfall <dave@horsfall.org> wrote:

Ah, leap seconds.  I work for an observatory.  Some things are in TAI and
some are in UTC.  At least now I know what to look for when something is 37
seconds off.


Isn't about that the transit of the Moon or something?

-- Dave_______________________________________________
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* Re: [COFF] What does your "cal" show? (fwd)
  2021-09-09  1:34 ` Adam Thornton
@ 2021-09-09  1:47   ` Warner Losh
  0 siblings, 0 replies; 3+ messages in thread
From: Warner Losh @ 2021-09-09  1:47 UTC (permalink / raw)
  To: Adam Thornton; +Cc: Computer Old Farts Followers


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On Wed, Sep 8, 2021, 7:34 PM Adam Thornton <athornton@gmail.com> wrote:

> Just variation of Earth’s rotational speed over time, AFAIK.
>
> http://leapsecond.com/java/gpsclock.htm -- TAI is SI second ticks, UTC is
> corrected to rotation by leap seconds.  Currently they are 37 seconds apart.
>

UTC is also SI seconds with an extra second inserted so celestial mean noon
doesn't drift. It's irregular as to when based on the irregular wobble of
the earth.

Warner

Adam
>
> On Sep 8, 2021, at 6:22 PM, Dave Horsfall <dave@horsfall.org> wrote:
>
> Ah, leap seconds.  I work for an observatory.  Some things are in TAI and
> some are in UTC.  At least now I know what to look for when something is 37
> seconds off.
>
>
> Isn't about that the transit of the Moon or something?
>
> -- Dave_______________________________________________
> COFF mailing list
> COFF@minnie.tuhs.org
> https://minnie.tuhs.org/cgi-bin/mailman/listinfo/coff
>
>
> _______________________________________________
> COFF mailing list
> COFF@minnie.tuhs.org
> https://minnie.tuhs.org/cgi-bin/mailman/listinfo/coff
>

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end of thread, other threads:[~2021-09-09  1:48 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-09  1:22 [COFF] What does your "cal" show? (fwd) Dave Horsfall
2021-09-09  1:34 ` Adam Thornton
2021-09-09  1:47   ` Warner Losh

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