When is the moon closest to the earth? when it's high above, or when it's known as aharvest moon?

I have taken psychology and the freaking bozo we studied from actually teaches others that the moon is closer to the earth when it is high above, versus when it is on the horizon. Now, I should have failed this cl because I refused to study any further dealing with his teachings, however I proved that his theory was a crock of **** and received an A in the cl. What was this guy's name?