Here's NASA's Animated Supermoon Eclipse Primer

September 27, 2015 2:35 PM

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If you’re wondering about the mechanics behind why the Moon looks bigger than usual tonight, or what that has to do with a lunar eclipse, this quick NASA animation will explain the basics of tonight’s astronomical event.

We call this a “supermoon,” but it’s actually a pretty simple optical illusion. As you can see in the animation, the Moon will be at perigee, the part of its orbit that brings it closest to Earth, tonight. We usually just say that the Moon is about 238,000 miles away, that’s an average; the distance...

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