The train follows the moon.

The so-called moon goes with you, because no matter how you go forward, the moon always hangs there, because the distance is too far, and how fast you go will not affect its position in the sky.

As for this sentence, it is because of our life experience. When someone walks with us, we will see that he always approaches us in the same direction. So we naturally apply the same situation to the moon, thinking that it will follow us. Paradoxically, however, people who move in any direction on the ground will see this scene. If everyone thinks that the moon is following them, it can't explain which direction the moon is going.

Then, back to the landlord's situation, it is natural to see the moon moving horizontally, because your train just turned the direction. Just as we see things around us moving left or right together, we will realize that we are turning.

Because it was night and only the moon could be seen, I don't know if the train was turning slowly. Maybe that one turns slowly and doesn't feel any centrifugal force. But if the landlord has a compass in his hand, he will definitely see the change of the pointer, which proves that he has turned.