[LEAPSECS] pick your own length of second

[Steve Allen]

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                 <sla at ucolick.org>                WGS-84 (GPS)
UCO/Lick Observatory--ISB   Natural Sciences II, Room 165    Lat  +36.99855
1156 High Street            Voice: +1 831 459 3046           Lng -122.06015
Santa Cruz, CA 95064        http://www.ucolick.org/~sla/     Hgt +250 m