How Does Angular Size of the Sun and Moon Work?

The angular size of the Sun and Moon is how big they look in the sky, even though they’re really far away, kind of like how a balloon looks tiny when it’s on the other side of the room.

Imagine you have a basketball. When you hold it right up to your face, it takes up almost all of your view, that's like the Moon or Sun being close. But if you move it way back, like across the room, it looks much smaller, that’s how they look in the sky.

The Sun and Moon are both really big, the Sun is about 109 times bigger than Earth, and the Moon is about a quarter of Earth's size. But they’re also super far away, the Sun is like 93 million miles away, and the Moon is about 238,000 miles away.

Even though the Sun is way bigger, it’s so much farther away that it looks almost exactly the same size as the Moon in the sky. That’s why during an eclipse, they can perfectly cover each other, like a basketball blocking another basketball from across the room!