private static function calculateYearInQuadCycle($year) {
        
        $yearInGrandCycle = static::calculateYearInGrandCycle($year);
        
        // static::FIRST_QUAD_CYCLE;
        $yearInQuadCycle = $yearInGrandCycle % static::FIRST_QUAD_CYCLE;
        
        if ((static::GRAND_CYCLE_LENGTH - static::SECOND_QUAD_CYCLE) < $yearInGrandCycle) {
            
            // static::SECOND_QUAD_CYCLE;
            $yearInQuadCycle = $yearInGrandCycle - (21 * static::FIRST_QUAD_CYCLE);
            
        }
        
        return $yearInQuadCycle;
    }