[tz] What's "right"?

[Michael H Deckers]

   On 2020-11-12 19:11, Paul Gilmartin via tz asked:


> Was UTC defined in 1970, or should it pedantically be GMT for 1970
> and 1971; TAI-10 thereafter?


    The time scale that was later called UTC was defined
    by the BIH since 1961-01-01. Its relation with the time
    scale later called TAI is given for instance in the
    Annual Reports of the BIH, using names TUC and UTC,
    of which the relevant pages are available in
    [ftp://ftp2.bipm.org/pub/tai/annual-reports/bih-annual-report/]
    The 1971 Annual Report also gives the relation of
    Stepped Atomic Time with TAI.

    Michael Deckers.