What are ellipsoidal models?

An ellipsoidal model is like imagining Earth as a slightly squished orange instead of a perfect ball.

Imagine you have an orange that's been gently squeezed from the top and bottom, it becomes wider around the middle. That shape is called an ellipse, and when we use it to describe Earth, we call it an ellipsoidal model.

Earth isn’t a perfect sphere, it’s like a squished orange. If you were to measure Earth from the North Pole to the South Pole, it's shorter than if you measured around the equator. So scientists make a special kind of shape called an ellipsoid that fits this squishing better than a ball.

When we draw maps or send satellites into space, we use these ellipsoidal models to help us know where things are. It's like using a slightly squished orange to figure out the best way to wrap a present, it helps make everything fit just right!