???? On 2019-06-05 05:28, Steve Allen wrote:
I have plowed through enough of Bulletin Horaire to find the complete history of UT2. https://www.ucolick.org/~sla/leapsecs/seasonal.html Missing from the earlier version of the plots on this web page was the story of how exactly the BIH performed the transition between the first version of UT2-UT1 and the second version. Naively the change of the expression requires a jump of 6 ms at the beginning of 1962, but that is not what the BIH dictated. Look at the middle plot and see how the year started along one curve and finished along the other.
???? Thanks! That clarifies that the 5 ms step down in UTC at 1961-01-01 ???? has nothing to do with the change in the formula for UT2 as a ???? function of UT1. ???? Nowadays, the role of UT2 is reduced: it is given in Bulletin A ???? as a linear function of UTC, as a means to extend the prediction ???? of UT1 as given in the Bulletins. ???? Michael Deckers. _______________________________________________ LEAPSECS mailing list [email protected] https://pairlist6.pair.net/mailman/listinfo/leapsecs
