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List or Specify the angular unit and mode used for box labelling. The mode can be ABSOLUTE to use sexagesimal notation in Hour - Degree for Right Ascension and Declination, or RELATIVE to label with offsets in the current angle unit.
SET ANGLE_UNIT
will list the current and fallback units (if any)
SET ANGLE_UNIT ABSOLUTE|RELATIVE
will toggle between ABSOLUTE labels and relative ones in the current
angular unit. ABSOLUTE labeling is not possible if there is a
rotation angle in the images: only relative labels are used in this case,
whatever the mode specified by SET ANGLE_UNIT.
SET ANGLE_UNIT Degree|Minute|Second|Radian
will set the current angle unit to the specified value, and enforce
use of offset labels in the specified unit.