Re: [LEAPSECS] NOT A cruel fraud!

From: Ed Davies <ls_at_edavies.nildram.co.uk>
Date: Sun, 22 Jan 2006 12:15:08 +0000

Earlier, I wrote:
> We all know that it (and any other world-wide timescale) is
> "postal" at the level of the time it takes light to cross a
> moderately small room but for microsecond precision and looser
> this is not an issue.

I ought to qualify that. There are, of course, time scales which
are synchronized across the world with much better than microsecond
precision (e.g., GPS time) but it's my understanding that they are
not anything like as uniform as TAI. Is this right? Can anybody
quote accuracy information for GPS time? At what level of precision
do time transfers using GPS time need out-of-band ("postal")
correction for uniformity?

This is all not directly relevant to convenient day-to-day civil
time but I think it'd be interesting to know better where the
boundaries are.

Ed.
Received on Sun Jan 22 2006 - 04:15:44 PST