[LEAPSECS] Schedule for success
Richard B. Langley
lang at unb.ca
Wed Dec 31 09:56:58 EST 2008
Quoting Poul-Henning Kamp <phk at phk.freebsd.dk>:
> In message <1230733996.495b82acce1c9 at webmail.unb.ca>, "Richard B. Langley" writ
> >iii) The introduction of the satellite Doppler technique (Transit) to help in
> >establishing the BIH meridian; the Doppler datum turned out to have a different
> >longitude origin.
> >iv) Misalignment of the series of WGS reference meridians with that of BIH.
> So which datum is used for the zero meridian, which defines the UT* family
> of timescales ?
That would be the current ITRF as established by the IERS:
It is a realization of the ITRS:
Richard B. Langley E-mail: lang at unb.ca
Geodetic Research Laboratory Web: http://www.unb.ca/GGE/
Dept. of Geodesy and Geomatics Engineering Phone: +1 506 453-5142
University of New Brunswick Fax: +1 506 453-4943
Fredericton, N.B., Canada E3B 5A3
Fredericton? Where's that? See: http://www.city.fredericton.nb.ca/
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