[time-nuts] June 30 2015 leap second

Didier Juges shalimr9 at gmail.com
Sat Jan 10 06:59:13 EST 2015


There are many systems for which the Google fix would not work in the
current state of technology unless implemented by EVERYBODY synchronously.
At least everybody who depends on precise time like banking and financial
systems, let alone the physicists and many others...

Keep in mind that this system drives you to having pretty bad time for the
better part of a whole day, on purpose... I realize that when the
alternative is a system crash, it may sound tempting, but it really is not
a fix, a bandage at most. We have a term for that in French: "empl√Ętre sur
une jambe de bois", cast on a wooden leg.

Didier KO4BB


On Fri, Jan 9, 2015 at 6:57 PM, Henry Hallam <henry at pericynthion.org> wrote:

> Such slewing solutions are OK for Google.  They wouldn't work well for
> one of the systems I work with, which uses system time to calculate
> the position of a LEO satellite for purpose of pointing a 7.6 meter
> X-band dish.  Half a second of error corresponds to a pointing error
> of 0.5 degrees, well outside the main lobe of the antenna beam.
>
> Anecdotally yours,
> Henry
>
> On Fri, Jan 9, 2015 at 2:30 PM, Hal Murray <hmurray at megapathdsl.net>
> wrote:
> >
> > time at patoka.org said:
> >> 1s/24h = 1/86400 which is approximately 12ppm. That means that Aging
> Offset
> >> could slow down my clock for 1 second if I'll apply the maximum  value
> one
> >> day ahead (roughly). I need to do some experiments first. ;-)  Its
> looks too
> >> unreliable for me.
> >
> > If you do it that way, your clock will be off by a whole second just
> before
> > midnight when the leap-second brings it back into sync.  If you tweak
> your
> > clock from noon-noon, it will only be off by 1/2 second at midnight when
> the
> > sign-bit of the error flips.
> >
> > --
> > These are my opinions.  I hate spam.
> >
> >
> >
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