[LEAPSECS] leapseconds, converting between GPS time (week, second) and UTC

[Steve Allen]

On Wed 2019-01-16T08:31:19+0000 Poul-Henning Kamp hath writ:
> In message <20190115205243.GB25854 at ucolick.org>, Steve Allen writes:
> >That evokes a challenge for all time nuts that I can make based on
> >reading Bulletin Horaire.
> >
> >What is the epoch that was used for TAI?
>
> Isn't that the same one Loran-C used ?  1958-01-01 00:00:00 GMT ?

Nope.

The epoch of TAI, and LORAN, and GPS is 1961-01-01T20:00:00 UT2.
Or maybe 1961-01-00 UT2.

That is when the atomic time scale was set to a specified value.

See a few pieces of the way that sausage was made here

https://www.ucolick.org/~sla/temporary/taiepoch/

--
Steve Allen                    <sla at ucolick.org>              WGS-84 (GPS)
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