The Great American Solar Eclipse

Here are two fortuitously coincidental facts: the sun is approximately 400 times further away from us as the moon, and the moon is approximately 400 times smaller than the sun. Because of that cosmic congruence, the moon and the sun appear to be the same size. The reason it’s fortuitous is that, during a solar eclipse, the moon exactly covers the face of the sun, allowing spectators a rare chance to see the sun’s atmosphere, or corona.