On Thu 2011-06-02T21:39:13 +0000, Poul-Henning Kamp hath writ:
> It is a good and instructive example of how leap seconds makes life
> more difficult for programmers.

The CDF document references these

IERS Conventions 
<http://www.iers.org/nn_11216/IERS/EN/Publications/TechnicalNotes/>

TEMPO 2 reducing pulsar timing observations 
<http://www.atnf.csiro.au/research/pulsar/ppta/tempo2/>

Much of that math, the 4-transforms, the gravitational potential
expansions, the time ephemeris, the ionization delay, depends on
somebody's estimate of what is, in effect, weather in the universe at
large.

By comparison leap seconds are trivial.

--
Steve Allen                 <[email protected]>                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
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