Find position angle between objects, in radians.

        Parameters
        ----------
        p : AngularPosition
            The object to which bearing must be determined.

        Notes
        -----
        This method calls the function bear(). See its docstring for
        details.

        See also
        --------
        bear

def bear(self, p):
        """Find position angle between objects, in radians.

        Parameters
        ----------
        p : AngularPosition
            The object to which bearing must be determined.

        Notes
        -----
        This method calls the function bear(). See its docstring for
        details.

        See also
        --------
        bear

        """
        return bear(self.alpha.r, self.delta.r, p.alpha.r, p.delta.r)