On Wed 2018-03-21T03:19:15-0700 Hal Murray hath writ: > I haven't seen any comments from astronomers with info on how accurate they > need UT1.
It depends. I described several telescopes for Future of UTC. paper 678 at http://hanksville.org/futureofutc/2011/preprints/index.html Optical telescopes have to be able to find a target where atmospheric refraction amounts to several arc minutes, and unpredictable variations of that can amount to many arc seconds. So in many cases one second of time is plenty good. Our robotic telescope with small FOV on the guider does better if it is given UT1 to 0.1 second. That telescope grabs the USNO predictions of EOP every week to update the pointing. -- Steve Allen <s...@ucolick.org> WGS-84 (GPS) UCO/Lick Observatory--ISB 260 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 LEAPSECS@leapsecond.com https://pairlist6.pair.net/mailman/listinfo/leapsecs