[LEAPSECS] Get off my lawn!

[Tom Van Baak]

>    This hasn't even been fully correct during the times when UT1 was

>    observed with zenith telescopes (before about 1980). It is incorrect

>    today -- all the seven parameters of Earth orientation are of course

>    determined together, and UT0 is no longer needed nor used by anybody.


Are the details about UT1 correct in this link?
http://hpiers.obspm.fr/iers/bul/bulb/explanatory.html

I ask because a number of posters claim UT1 is a measure of
earth angle. At one level this is true, of course, but if I read that
document correctly it says that certain periodic terms have been
removed from UT1. I think that's where the confusion arises -- it
makes UT1 seem more like it's trying to be a clock and less like
a precise measure of angle.

Perhaps you can clear up the mystery.

/tvb