On Sunday, September 21, we are experiencing a partial solar eclipse—one that can be viewed by only 0.2% of the population. Wondering if you’re one of the lucky ones? Here’s everything you should know about this upcoming solar eclipse—and how it will affect you.

What Is a Partial Solar Eclipse?

Solar eclipses of any sort occur on the same day as the full moon, as the moon passes in front of the sun, affecting our view from here on Earth. During a partial solar eclipse, however, the moon only blocks a portion of the sun, often making it look like a small crescent. So, if you notice a chunk of the sun missing (like a massive bite of a cookie), don’t be startled.

According to NASA, “A partial solar eclipse happens when the moon passes between the sun and Earth, but the sun, moon, and Earth

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