Imagine you are a ship’s captain in 1707. You know how far north or south you are by the height of the sun. But east to west? You are guessing. Then, one foggy night, your fleet smashes into the rocks of the Scilly Isles. 2,000 men perish. The problem wasn't bad weather—it was a lack of lines .
But here is the catch: Nature never told us where to start counting. meridians longitude
It is the only place on Earth where a single step can alter your calendar. Why was longitude so deadly for sailors? Because the Earth rotates 15° every hour. To know your longitude, you need to know the exact time at your home port while standing on a pitching deck in a storm. Imagine you are a ship’s captain in 1707