On Thu 2014-03-20T15:20:43 -0400, Gerard Ashton hath writ: > There has much discussion on the list about when the current definition of > UTC will become unworkable, and when a UTC would become unworkable if leap > seconds are discontinued, but I don't think there has been anything more > than hand waving about when UT1 would need to change.
That there would be a deviation between mean midnight at Greenwich and Universal Time was pointed out at least as early as the Explanatory Supplement from the 1960s. In the past couple of years Seidelmann and Seago have looked at the deviation in more detail in http://www.agi.com/resources/user-resources/downloads/white-paper.aspx?id=162 and there is another nice plot in the final talk and paper at the 2013 Future of UTC meeting in Charlottesville http://futureofutc.org/ > So does anyone know of any evaluation of the longevity of the expression for > UT1? In short, they find a current difference of around 0.2 s that will grow at a rate of about 1/365.25 * DeltaT -- Steve Allen <[email protected]> WGS-84 (GPS) UCO/Lick Observatory--ISB Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m _______________________________________________ LEAPSECS mailing list [email protected] http://six.pairlist.net/mailman/listinfo/leapsecs
