Here’s the classic trick from every adventure movie ever: Polaris, the North Star. It sits almost directly above the North Pole, so its height in the sky is your latitude.
Find the Big Dipper—it looks like a soup ladle (very fitting). Follow the two stars at the front of the bowl, and they point right to Polaris. Now, measure how high Polaris is above the horizon using your hand or a sextant.
That angle in degrees? That’s your latitude. If Polaris is at 40 degrees, you’re near Philadelphia. If it’s at 90 degrees, you’re at the North Pole (and probably freezing, so put on a coat).
Wait, What About the Southern Hemisphere?
If you’re below the Equator, Polaris is a no-show. You’ll use the Southern Cross constellation instead. It looks like a kite that’s lost its tail.
Find the long axis of the cross, imagine a line extending from it by about 4.5 times the cross’s length, and that points to the South Celestial Pole. The angle between that imaginary spot and the horizon is your latitude. It’s like playing connect-the-dots with the universe.
