Tracking offsets returned by the tracking_offsets() function.

Definition:

This is a built-in group datatype, defined as:

  group TrackingOffsets {
    Double az,      # Azimuth tracking offset.
    Double el,      # Elevation tracking offset.
    Double ra,      # Right Ascension tracking offset.
    Double dec,     # Declination tracking offset.
    Double x,       # Sky x-axis tracking offset.
    Double y        # Sky y-axis tracking offset.
  }

Please see the documentation of the offset command for an explanation of the offsets that this datatype holds.

Example:

The following example stores the current tracking offsets in a TrackingOffsets variable called f. It then does an indeterminate number of things, including changing the azimuth and elevation offsets. Then finally it restores the original azimuth and elevation tracking offsets in the f variable.

 TrackingOffsets f = $tracking_offsets()
 ...
 offset az=1:0:30, el=0:10:12
 ...
 offset az=$f.az, el=$f.el