[LEAPSECS] Looking-glass, through

Matsakis, Demetrios matsakis.demetrios at usno.navy.mil
Fri Jan 14 11:45:12 EST 2011

I can't help with the flying cars, but UTC does "deliver" a frequency
that is the most precisely and accurately measured quantity known to
humans. Time is the integral of that frequency, and over one
leapsecond-less day a frequency error of 1.E-12 corresponds to a time
error of 86400*1.E-12 = 86 nanoseconds.

The USNO and BIPM web pages give our algorithms, though it takes a bit
of clicking. The basic idea is that each clock's systematic errors in
time, frequency and/or frequency drift are corrected for and the result
goes into a weighted average.

-----Original Message-----
From: leapsecs-bounces at leapsecond.com
[mailto:leapsecs-bounces at leapsecond.com] On Behalf Of Sanjeev Gupta
Sent: Friday, January 14, 2011 2:23 AM
To: Leap Second Discussion List
Subject: Re: [LEAPSECS] Looking-glass, through

On Fri, Jan 14, 2011 at 13:47, Tom Van Baak <tvb at leapsecond.com> wrote:

You really didn't expect 250 diffeent atomic clocks around
the world to all agree at the ns level at all times did you?

Why not? nano is 10E-9, and I see references to people trying for
clocks with 10E-12 on this list.

And what good is the "atom" part of an atomic clock, if it can't even
handle "nano"?

Still waiting for the flying cars I was promised ...
Sanjeev Gupta
+65 98551208 http://www.linkedin.com/in/ghane

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