On Wed 2012-01-11T13:03:52 -0700, Warner Losh hath writ:
> Question about format.  Looks to be
>
> year  delta-t (in-seconds)    ????    # source
>
> what's the ??? (third column)?  What's the difference in the second column?  
> TAI-TT or something else?

First column is Besselian (I think) astronomical year.
Second column is Delta T in seconds, i.e. diff of UT (or UT1) and TT (or ET)
Third numeric column (when it exists) is their uncertainty in seconds.

--
Steve Allen                 <s...@ucolick.org>                WGS-84 (GPS)
UCO/Lick Observatory--ISB   Natural Sciences II, Room 165    Lat  +36.99855
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