code: public static CyclicYear of(
          Stem stem,
          Branch branch
      ) {
  
          int a = stem.ordinal();
          int b = branch.ordinal();
          int yearOfCycle = (a + 1 + MathUtils.floorModulo(25 * (b - a), 60));
          return CyclicYear.of(yearOfCycle);
  
      }
docs: /*[deutsch]
  <p>Liefert eine Instanz eines zyklischen Jahres. </p>
  
  @param   stem    celestial stem
  @param   branch  terrestrial branch
  @return  CyclicYear