[LEAPSECS] pick your own length of second

Steve Allen sla at ucolick.org
Wed Jan 11 15:19:50 EST 2012


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
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