The short answer is Stephen L. Moshier via Michael Sternberg. Please see the Credits section of the Help for more information. Unfortunately some of the URLs quoted therein have grown stale.
Elwood
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--- In xephem@..., "Eric" <svsarana@...> wrote:
I've been looking at the techniques for the delta t calculation and trying to understand what is going on with the reference data.
The data in the tables don't match the years from the UNSO () where the deltat.c code says the data was taken from.
Just a quick example set from the deltat.c vs. the UNSO data:
deltat.c dt[1740]=12.0
Unso[1740]=13.5
deltat.c dt[1800]=13.7
Unso[1800]=12.6
deltat.c dt[1980]=50.54
Unso[1980]=50.54
Also the UNSO data stops at 1657, yet deltat.c has data from 1620-1656. Any one know where this comes from and why the early years like 1620 is so large (124.0)?
Thanks,
Eric
