[LEAPSECS] Get off my lawn!
Tom Van Baak
tvb at LeapSecond.com
Sat Jun 18 12:31:36 EDT 2011
> 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?
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.
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