How Does Sextants and the History of Celestial Navigation Work?

A sextant is like a super-detailed protractor that helps sailors find out where they are using the stars and sun, just like how you might use a ruler to measure your height.

Imagine you're on a boat in the middle of the ocean. You can’t see land, but you can see the sun. With a sextant, you can figure out how high the sun is above the horizon, which tells you what time it is, kind of like using a clock that’s powered by the sky.

A sextant has mirrors and a scale, like a ruler with numbers on it. When you look through it at the sun or a star, the mirrors help you line up two images: one from the object in the sky and one from the horizon. The angle between them is measured on the scale.

By knowing that angle, and what time it is (or what date it is), you can figure out your latitude, how far north or south you are on Earth. It’s like solving a puzzle with the sky as your helper!

Sailors used this tool for hundreds of years before GPS came along, making long trips across oceans much easier and more accurate.