[LEAPSECS] complete history of UT2
sla at ucolick.org
Wed Jun 5 01:28:55 EDT 2019
I have plowed through enough of Bulletin Horaire to find the complete
history of UT2.
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 <sla at ucolick.org> 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
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