On 8 Jan 2007 at 0:15, Tony Finch wrote:

> How did you extend the UTC translation back past 1972 if the undelying
> clock followed TAI? I assume that beyond some point in the past you say
> that the clock times are a representation of UT. However TAI matched UT in
> 1958 and between then and 1972 you somehow have to deal with a 10s offset.

Formulas for UTC, as actually defined at the time, go back to 1961
here:

ftp://maia.usno.navy.mil/ser7/tai-utc.dat

It appears the offset was 1.4228180 seconds at the start of this.

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