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. This also means that it is possible to make a complete regression of the values of TA-UT1 back to the inception of Essen's original cesium chronometer in 1955 July. Doing that requires modifying each of the varying forms of the tabulations in the pages of Bulletin Horaire so that everything is transformed into a single reference system. -- Steve Allen <[email protected]> WGS-84 (GPS) UCO/Lick Observatory--ISB 260 Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 https://www.ucolick.org/~sla/ Hgt +250 m _______________________________________________ LEAPSECS mailing list [email protected] https://pairlist6.pair.net/mailman/listinfo/leapsecs
