code: def _check_consistent_units_orbitInput(self,orb):
          
          if self._roSet and orb._roSet:
              assert m.fabs(self._ro-orb._ro) < 10.**-10., 'Physical conversion for the actionAngle object is not consistent with that of the Orbit given to it'
          if self._voSet and orb._voSet:
              assert m.fabs(self._vo-orb._vo) < 10.**-10., 'Physical conversion for the actionAngle object is not consistent with that of the Orbit given to it'
          return None
docs: Internal function to check that the set of units for this object is consistent with that for an input orbit