Angular spearation between objects in radians.

        Parameters
        ----------
        p : AngularPosition
            The object to which the separation from the current object
            is to be calculated.

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

        See also
        --------
        sep

def sep(self, p):
        """Angular spearation between objects in radians.

        Parameters
        ----------
        p : AngularPosition
            The object to which the separation from the current object
            is to be calculated.

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

        See also
        --------
        sep

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