What is Prime Meridian (0° longitude)?

The Prime Meridian is like the starting line for measuring how far east or west you are on Earth.

Imagine you're playing a game where you walk around a big circle, that’s like going all the way around the world. The Prime Meridian is the line you start at, just like the beginning of a race track. It's right in the middle of London, England, and it's marked as 0° longitude.

Think of Earth as a big pizza that’s been cut into slices, each slice represents how far east or west you are from the starting line. The Prime Meridian is like the first knife cut in the middle of the pizza. When you move to the right, you're going east, and when you move to the left, you're going west.

People use the Prime Meridian to figure out time zones and locations on maps. It’s like having a special marker that helps everyone agree on where they are, just like a starting line in a race!