about four o'clock
`` Yes ; it is now forenoon , and we must not forget that the shadow will point in a different direction in six hours from now . '' `` I have taken note of that , '' replied Harry . `` We are now following our shadow , see ? In six hours , which will be about four o'clock , which direction must we go to reach the wagon , judging by the shadow ? '' `` Let me see ; the shadow is to the southwest now . At four this afternoon , it will be about southeast , so , I suppose , we shall have to take a course with the shadow at our right hand . '' `` Correct !