Re: [LEAPSECS] building consensus

From: Steve Allen <sla_at_UCOLICK.ORG>
Date: Thu, 1 Jun 2006 07:00:41 -0700

On Thu 2006-06-01T06:25:39 -0700, Tom Van Baak hath writ:
> > UT1 et al are not really measures of time, but of angle (of Terran
> > rotation).
> To some degree yes, but don't they also include minor
> corrections (polar motion, longitude, etc.) and so at one
> level they already depart from raw angle measurement
> and instead are trying to act like clocks?

Yes. It is ironic that UT1 and UT2 were introduced in hopes of
getting timeservices worldwide to finally start broadcasting time
signals that agreed, but that because the observatories feeding the
data to the broadcasters would not abandon the self-inconsistent
values for their "conventional longitudes" (c.f. Janssen and Newcomb
at the 1884 IMC) the signals did not start to agree until coordinated
cesium clocks were in use.

Steve Allen                 <>                WGS-84 (GPS)
UCO/Lick Observatory        Natural Sciences II, Room 165    Lat  +36.99858
University of California    Voice: +1 831 459 3046           Lng -122.06014
Santa Cruz, CA 95064     Hgt +250 m
Received on Thu Jun 01 2006 - 07:00:58 PDT

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