... It is running in drift scan mode and then driven basketweaving on the meridian. ... The drift scanning is to make a map. They move in az,za to the start of the map and then let the telescope drift for 840 seconds. ... The telescope then moves to the start of the next strip (a strip is defined by the width of the alfa beampattern). 23jun05: ra/dec (j2000) coverage of drift scans for 22/23jun05 (.ps) ( .pdf ). ... The positions computed from the az, za and the time stamp of the data. ...