code: public static String getZodiac(Calendar calendar) {
  		if (null == calendar) {
  			return null;
  		}
  		return getZodiac(calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH));
  	}
docs: 通过生日计算星座
  
  @param calendar 出生日期
  @return 星座名