“Ask an astronomer and they say, ‘Half a degree, 180th of a right angle’ (the same as any other full moon),” said Terry Richardson, College of Charleston senior astronomy instructor, chuckling. “This will be a big half a degree.”
But it’s going to seem monstrous. The full moon will be at perigee on Saturday, the point in its orbit closest to earth. NASA’s website said the phenomenon is a super perigee moon, the biggest in almost 20 years.