Millions of Americans in the United States will be able to see a total solar eclipse on April 8, 2024. It will be the last chance for those in the lower 48 states to see one for 21 years. Even if you can’t get to the path of totality, which is where the moon’s shadow covers the sun, you’ll at least see a partial solar eclipse over the course of the day.

So — if you’re wondering how you can witness what some folks call a life-changing event to why they happen in the first place, follow along here for answers to all of your questions and more.