[time-nuts] Why 9,192,631,770 ??

[David]

James Burke did a whole episode of Connections on that subject:

https://www.youtube.com/playlist?list=PL777ACC303F62C744

The oldest example of an automated phase locked loop I have heard of
was used for calibrating newly built pendulum clocks to a master
pendulum clock.

On Wed, 9 May 2012 17:45:06 -0500, "Don Lewis"
<dlewis6767 at austin.rr.com> wrote:

>Thanks, all ...this thread has helped me a lot.
>
>It reinforces my beliefs of what a 'second' is ...what we were taught from
>day 1 in school:
>
>One solar day/86,400 (A 'solar' day being an earth solar day)
>  
>So as I try to rationalize all this in my mind, ...a good cesium unit is
>just a sophisticated 'counter'.  The counter gate is just the solar day.
>
>It's interesting to note (to ask?): When did someone get smart enough to
>start measuring 1/86thousthanth of a day, ....That starts needing a standard
>in itself.