December 13th, 2010
Episode 243 of 478 episodes
Before there was GPS, navigators had to rely on the Sun and the stars to find their way around the Earth. It's easier than it sounds, if you've got the right instruments, clear skies, and a really accurate clock. Let's examine the history of celestial navigation, learn about the different methods, and then give you some practical ways that you can go out and learn how to do this for yourself.