[Datetime-SIG] Fwd: Calendar vs timespan calculations...

[Alexander Belopolsky]

On Wed, Aug 5, 2015 at 7:18 PM, M.-A. Lemburg <mal at egenix.com> wrote:
> and their direct influence on the UTC-TAI difference:
>
>     http://hpiers.obspm.fr/eop-pc/index.php?index=leapsecond&lang=en

Cool plot, but "due to the initial choice of the value of the second
(1/86400 mean solar day of the year 1820)" sounds like nonsense.   How
did they measure the "mean solar day  of the year 1820" in caesium-133
radiation periods without sending someone back in time with an atomic
clock?   I thought only Guido had a time machine!