[LEAPSECS] Schedule for success

Poul-Henning Kamp phk at phk.freebsd.dk
Wed Dec 31 11:09:13 EST 2008

In message <1230738511.495b944f91ce3 at webmail.unb.ca>, "Richard B. Langley" writes:

>Quoting Poul-Henning Kamp <phk at phk.freebsd.dk>:


>> And since WGS84 is not rigidly linked to ITRS, doesn't that mean

>> that in order to use DUT1 broadcasts to point a telescope (precisely[1])

>> you also need to the ITRS/WGS84 difference at your place ?


>> Has anybody calculated what the worst case DUT1 difference is in

>> the WGS84 datum ?


>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 ?

Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

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