What is 30 degrees west of Greenwich?

Imagine Earth is like a giant clock face, and Greenwich is the number 12 on that clock, it's where we start counting time and directions from. Now, 30 degrees west of Greenwich means you're moving 30 steps backwards around that clock face, just like stepping back from your favorite spot in a playground.

If Earth is a clock, then lines going around it are called lines of longitude, and they help us know where we are. Greenwich is at 0 degrees, the starting point. If you go west from there, you're moving to the left on that clock face.

So if you're 30 degrees west, you're like a kid who’s 30 steps away from home, but in the direction of the playground's slide, it's a specific place on Earth, just like your favorite spot is a specific place in your neighborhood.