FW: correction for tzdata/leapseconds

[Markus Kuhn]

"Olson, Arthur David (NCI)" wrote on 1999-07-22 13:43 UTC:
> From:	Michael Deckers [SMTP:Michael.Deckers at mch6.siemens.de]
> Sent:	Thursday, July 22, 1999 6:29 AM
> To:	tz at elsie.nci.nih.gov
> Subject:	correction for tzdata/leapseconds
> 
> 
>    Just a quibble in the file "@(#)leapseconds	7.11" in 
>    ftp://elsie.nci.nih.gov/pub/tzdata1999d.tar.gz:
> 
> # The International Earth Rotation Service periodically uses leap seconds
> # to keep UTC to within 0.9 s of TAI (atomic time); see
>                                  *****************
>    This becomes correct only with UT1 in place of TAI.

I agree. The string "TAI (atomic time)" should definitely be replaced by
something like "UT1 (astronomical earth time, corrected for known
periodic fluctuations)".

See also

  http://www.cl.cam.ac.uk/~mgk25/volatile/ITU-R-TF.460-4.pdf
  http://www.cl.cam.ac.uk/~mgk25/volatile/astronomical-time.pdf

for the official definition of UTC, but please don't include these URLs
(only temporarily available).

Markus

-- 
Markus G. Kuhn, Computer Laboratory, University of Cambridge, UK
Email: mkuhn at acm.org,  WWW: <http://www.cl.cam.ac.uk/~mgk25/>