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+.help dbear Jun99 "Slalib Package"
+.nf
+
+      DOUBLE PRECISION FUNCTION slDBER (A1, B1, A2, B2)
+
+     - - - - - -
+      D B E R
+     - - - - - -
+
+  Bearing (position angle) of one point on a sphere relative to another
+  (double precision)
+
+  Given:
+     A1,B1    d    spherical coordinates of one point
+     A2,B2    d    spherical coordinates of the other point
+
+  (The spherical coordinates are RA,Dec, Long,Lat etc, in radians.)
+
+  The result is the bearing (position angle), in radians, of point
+  A2,B2 as seen from point A1,B1.  It is in the range +/- pi.  If
+  A2,B2 is due east of A1,B1 the bearing is +pi/2.  Zero is returned
+  if the two points are coincident.
+
+  P.T.Wallace   Starlink   23 March 1991
+
+  Copyright (C) 1995 Rutherford Appleton Laboratory
+  Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
+
+.fi
+.endhelp