Adrian Godwin wrote:
>
> How much variation in the rate of leap second insertion is there?
1972-01-01 - 1992-01-01 : 17
1973-01-01 - 1993-01-01 : 16
1974-01-01 - 1994-01-01 : 16
1975-01-01 - 1995-01-01 : 16
1976-01-01 - 1996-01-01 : 15
1977-01-01 - 1997-01-01 : 15
1978-01-01 - 1998-01-01 : 15
Attila Kinali wrote:
> Mike Cook wrote:
>
> > c. The first commercial cesium clocks were available in 1956, but the
> > second did not get redefined until 1967. There is no rush.
>
> Which caesium beam standards were available in 1956?
The Atomichron, I think:
Will Kimber wrote:
>
> The thing with TIME is that its measurement is a abstract concept. Most
> other "standards" have a physical representation.
The metre is derived from the second and the speed of light using
interferometry. The kg is derived from the metre and the second and the
planck
Tom Van Baak wrote:
> > There's another relatively simple clue in the old GPS signal: the leap
> > second count!
>
> The idea was proposed 20+ years ago, Trimble even has a patent on it.
> Details here:
>
> http://leapsecond.com/notes/gpswnro.htm
Oh, wonderful :-)
> But it turns out not to
Leo Bodnar wrote:
> Assume that the device does not have any reliable long term non-volatile
> memory that you can update.
> In the absence of any clues your only reliable piece of knowledge is
> that the cold start date is somewhere after the date of manufacturing
> or, most often, firmware
Hal Murray wrote:
>
> The 10/100/1000 on Ethernet speed refers to net data rate. The actual bit
> rate on the wire is faster to compensate for things like 8B/10B encoding. For
> example, 100 megabit Ethernet is actually 125 on the wire if you look at it
> with a scope.
The symbol rate for
Philip Gladstone wrote:
>
> The data that I get is surprising in that the pendulum swing varies
> according to the position of the hands on the clock.
Clocks with large outdoor faces have extra problems along those lines...
http://trin-hosts.trin.cam.ac.uk/clock/main.php?menu_option=pigeons
Tom Van Baak wrote:
>
> The new years celebrations last night remind me of another source of time:
> time balls.
There's a splendid building in Leeds that used to be a clock-maker's shop.
https://en.wikipedia.org/wiki/Time_Ball_Buildings,_Leeds
(tho last time I was there it was looking rather
