The issues of BIH Bulletin Horaire contain tabulations of clock offsets from the 1920s onward. Starting with 1931 Nicolas Stoyko had devised an algorithm for combining the contributions of all the observatories into a single "mean observatory". Issues of Bulletin Horaire tabulated Heure definitive as offsets of broadcast time signals and various observatories from the BIH mean.
Unfortunately for posterity the mean observatory algorithm that was used into the 1960s produces a (potentially) different systematic offset for each calendar year. That means that simply picking up an issue of Bulletin Horaire does not allow its tabulations to be compared to any other year. One of the things that Nicolas and Anna Stoyko did just before they retired was to publish their best estimates for the systematic offsets of all BIH data starting in 1931. When those are plotted they look like the image on this web page. https://www.ucolick.org/~sla/leapsecs/BHsHn02p043.html -- 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
