Use a Wristwatch as a Compass

Hold a watch with the 12 o’clock at the leftmost part of your hand. Move your arm so that the hour hand points at the sun. The spot halfway between the hour hand and the 12 is south. [via 08.06 Wired magazine]

下面是一个小技巧，能让你用手表和太阳找出南方来：很简单：按上图把手表放在手掌上，让12点指向正左方，然后把时针指向太阳的位置，那么时针与12点方向形成的角的角平分线指向的就是南方。