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From: tdxsys@dartvax.UUCP (TDX sys Mark Mullen)
Newsgroups: net.astro,net.astro.expert
Subject: Question: Errors in R.A. and Dec.
Message-ID: <2203@dartvax.UUCP>
Date: Fri, 13-Jul-84 17:09:23 EDT
Article-I.D.: dartvax.2203
Posted: Fri Jul 13 17:09:23 1984
Date-Received: Thu, 19-Jul-84 02:14:27 EDT
Organization: (Mark Mullin @ TDX SYSTEMS,Vienna VA)
Lines: 8


        To what degree of accuracy can astronomical observatories measure
the RA and DEC of celestial objects?
        Errors in measurement dure to rotation amay account for ten seconds
of arc.
        Neglecting,perhaps, transits used by U.S. Naval observatories, can
observatory telescopes measure true RA and DEC to, say, one second ofr arc
with just one sighting?