This one is surprisingly simple, and if you are ever caught without a compass, may come in handy during the daytime other than high noon... Place a stick upright in the ground so you can see its shadow. Mark the spot where the tip of the shadow falls with a rock. Wait fifteen minutes, then mark the shadow's tip with a second rock. The line between the rocks is roughly east to west. If you stand with the first rock on your left and the second rock on your right, you are facing north. The sun always rises in the east and sets in the west, but not exactly due east or due west. In the northern hemisphere, the sun will be due south when at its highest point in the sky, or when an object casts no discernible shadow. In the southern hemisphere, this same noonday sun will mark due north. In the northern hemisphere, shadows will move clockwise. Shadows will move counterclockwise in the southern hemisphere. With practice, you can use shadows to determine both direction and time of day.