That's an interesting approach getting ISO involved. I have no
direct experience with that group; can you fill some of us in on
the workings, or the scope of that institution? And specifically,
how does ISO relate to, or compare to, ITU, or BIPM (which I
assumed was in change of the system of
A gentle reminder from your host -- please keep this discussion
list somewhat technical. Every now and then it gets out of hand.
/tvb
http://www.LeapSecond.com
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All forms of UT1 have been direct measures of earth rotation. One can
argue about zero points and drifts, but the underlying purpose of UT1
is to monitor rotation with a value that tracks where the sun is over
the earth. In that sense UT1 tries to be a form of mean solar time,
so it merits a
to consider -- LSEM
On Nov 2, 2010, at 10:15 PM, Tom Van Baak wrote:
What would happen if instead of getting rid of leap seconds
we had *more* of them? So many more that all software just
had to implement them. And so often that products would
have a plenty of chances to be leap second qualified before
Oh, and our own beloved TVB whose time lab can keep UTC no worse than
NIST or whoever owns the leapseconds.com domain. Once IERS ceases to
allow the use of their IT resources to distribute leap second
announcements, a new mailing list will need to be set up.
Leapsecond.com is clearly a good
Are the archives from the original list available somewhere? I would
appreciate a pointer!
Rob
Yes, several of us have a complete set of postings from when
the list has hosted on the USNO server. Making them correct
and in a format suitable for web browsing is the challenge.
/tvb
So what I'm hearing is that the group is unaware of any specific
issues with civilian GPS units?
Rob,
In the past few months some civilian receivers experienced
glitches that were eventually correlated to changes made in
ground control software or something like that. The changes
were still
This is the part I disagree with. Global civil time (the underlying
timescale for the numerous local civil time variants) needs to be
stationary with respect to mean solar time. The requirements for
Rob,
A problem is what defines your stationary (what bandwidth)
and what defines mean
Also, the comments section of that article includes the actual code
behind the Zume bug, which involves the system getting put in an
infinite loop on reaching a day number of 366, even though the code
did in fact attempt to be cognizant of leap years.
Dan, thanks for the rtt.c link
From: Rob Seaman sea...@noao.edu
Very cute!
Unfortunately, it just demanded I reload.
Yeah, I had to put that in because some browsers apparently did
not cache the nixie tube images correctly. The result was that my
web site would get hammered for hours serving every digit every
second.
/tvb
Along those lines ...
The earliest use of the term UTC as such (and TUC in the French) that
I have found is in the Jan/Feb 1964 Bulletin Horaire from the BIH.
This was the first issue done by Guinot after Anna Stoyko gave it up.
Does anyone know of a use of the term UTC/TUC which predates that?
To be more convincing I'd like to see what happens to their
model if they used 5, 10, or 15 terms instead of 17. Plotting
the quality of fit against the number of terms used would be
revealing.
Also I'd like to see what happens to their projections if they
used a shorter or longer range of
A positive leap second will be introduced at the end of December 2008.
Good. I guessed right this time:
http://www.leapsecond.com/java/nixie.htm
/tvb
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Should we make an informal bet on when the next leap second happens ?
http://www.leapsecond.com/java/nixie.htm
/tvb
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This may be of interest:
Electromagnetic Link Deep in the Earth Varies the Length of the Day
http://www.spectrum.ieee.org/print/6123
see also:
The Electrical Conductivity of Post-Perovskite in Earth's D'' Layer
http://www.sciencemag.org/cgi/content/full/320/5872/89
or:
So when these various governments update their laws to
specify UTC rather than GMT as the basis of civil time, I
assume this is also an indirect acceptance of HH:23:60
local time as a now legal time-stamp?
Related to that - does anyone have an original copy of an
email header with xx:23:60 in
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