just use the daily global combined broadcast ephemerides made available by the IGS, e.g.: <ftp://cddis.gsfc.nasa.gov/gps/data/daily/2002/175/02n/brdc1750.02n.Z> for 24 June 2002; calculate your day-of-year here: <http://sopac.ucsd.edu/scripts/convertDate.cgi>
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