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The telescope axis can be determined by rapidly slewing the telescope along the
RA axis during an exposure, at 50% maximum slew speed.
If the telescope is pointing along the dec axis,
the stars should create circles around the center of the CCD. Finding this
position can take a few trials. It need not be precise, (up to
is fine, for there are other
large systematic errors in the two-star rotation matrix.
Finding the Telescope Pole Offset -
When the telescope is pointing along its axis, record the axis 1 encoder
position using rstat described in Section 2.5.4.
Convert this to degrees by dividing by the conversion factor in schierd.conf, which should be 19395. Subtract the converted value from ,
and you have the offset.