The most famous method uses the North Star, Polaris. Imagine the sky is a giant dome, and Polaris sits almost perfectly above the North Pole. If you measure the angle between the horizon and Polaris, guess what? That angle is your latitude in the Northern Hemisphere.
Think of it like this: at the North Pole (90° north), the North Star is directly overhead, a 90° angle. At the equator (0°), it’s on the horizon, a 0° angle. So, if you measure that star at 40° above the horizon, you’re roughly at 40° north latitude. It’s like the star is pointing a steady, celestial finger right at you.
No North Star in the Southern Hemisphere? No problem. You use a different star group called the Southern Cross, or you wait for the sun. The principle is exactly the same, just find your celestial anchor.
