On clear nights in Columbia, Jim Rose watches the moon. He wonders why the moon's disc seems to rotate clockwise during the night. Craters that point down at moonrise point up 12 hours later. It's not the moon, Jim. It's you. At moonrise, you're facing east to observe it, and the moon's "top" (western) edge leads it west. At moonset 12 hours later, you've turned west, and the same leading edge now points "down." It's your head that rotated 180 degrees as the Earth turned, not the moon.