code: public List<Orbit> calculateOrbits() {
          List<Orbit> orbits = new ArrayList<Orbit>();
          List<SymmetryClass> symmetryClasses = super.getSymmetryClasses();
          for (SymmetryClass symmetryClass : symmetryClasses) {
              Orbit orbit = new Orbit(symmetryClass.getSignatureString(), -1);
              for (int atomIndex : symmetryClass) {
                  orbit.addAtom(atomIndex);
              }
              orbits.add(orbit);
          }
          return orbits;
      }
docs: Calculates the orbits of the atoms of the molecule.
  
  @return a list of orbits