ELI5: Why doesn’t a solar eclipse happen every month?

Imagine the Sun is a big, bright lamp, the Earth is your head, and the Moon is a small ball you're holding.

A solar eclipse happens when the Moon goes right between the Sun and your head, blocking the Sun's light and making it look dark for a little while.

So, why doesn't this happen every time the Moon goes around your head (the Earth)?

Here's why:

• Tilt-a-whirl: The Moon's path around the Earth isn't perfectly flat like a plate. It's tilted a little bit, like a slightly tilted hula hoop around your head.

• Most of the time, the Moon misses: Because of this tilt, most months when the Moon goes around the Earth, it passes above or below the Sun from our point of view. Imagine the ball passing just a little too high or too low - it doesn't block the light.

• Perfect alignment is rare: Only when the Sun, Moon, and Earth line up perfectly on the same flat plane does the Moon block the Sun's light and create a solar eclipse. This perfect lineup doesn't happen every month because of the Moon's tilted path. It's like trying to throw a ball through a small hoop – you need everything to be just right!