[tz] Danish Time not UTC

[Tony Finch]

Brian Inglis <Brian.Inglis at SystematicSw.ab.ca> wrote:

> On 2016-11-09 03:23, Tony Finch wrote:
> > Brian Inglis <Brian.Inglis at SystematicSw.ab.ca> wrote:
> >
> > > I think UK legal time is also still some variety of GMT, as may be
> > > some other Commonwealth countries.
>
> > British law refers to mean time, but the Greenwich Observatory and
> > subsequently NPL have only provided UTC since it started.
>
> Royal Observatory Greenwich and Royal Greenwich Observatory (at
> Herstmonceaux 1947-1990, then Cambridge 1990-1998, before closing)
> provided astronomical and navigational products for GMT, GCT, GMAT,
> GMST, UT, UT0, UT1, UT2 (used for radio time signals), ET, etc.

UT2 might have been used for radio time signals in the 1960s (though I
thought it was rubber-seconds UTC then) but after 1972 British
general-purpose time signals were all UTC.

See for example section 5.5.6.1 in
http://www.lib.cam.ac.uk/deptserv/manuscripts/RGO_history/rgo_home_ch5.html

> They did participate in CUT, originally from RGO, NPL, USNO, then BIH.
> The atomic standard TAI, its civil UTC derivative, and frequencies, are
> physical standards set and provided by NMIs coordinated by the BIPM.

Tony.
-- 
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