[LEAPSECS] Schedule for success
sla at ucolick.org
Wed Dec 31 11:24:30 EST 2008
On Wed 2008-12-31T16:09:13 +0000, Poul-Henning Kamp hath writ:
> In message <1230738511.495b944f91ce3 at webmail.unb.ca>, "Richard B. Langley" writes:
> >The current version of WGS84 differs from the current version of ITRF by only a few
> >centimetres. WGS84 was purposely updated to agree as closely as possibly with ITRF.
> But it is not guaranteed to keep close, is it ?
This is pretty much the same as asking whether GPS time will remain
close to (TAI - 19 s), and in a sense, whether it's okay to use GPS
time as a proxy for TAI.
It boils down to asking whether the US DoD intends to continue to
comply with international standards, and if so, how accurately.
We have seen that the international timekeepers of the BIPM get livid
when someone suggests that GPS time could be used in an official sense.
The IERS seems to be a bit more mellow.
Steve Allen <sla at ucolick.org> WGS-84 (GPS)
UCO/Lick Observatory Natural Sciences II, Room 165 Lat +36.99855
University of California Voice: +1 831 459 3046 Lng -122.06015
Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m
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