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_______________________________________________
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