docs: 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)