That’s right: For 70 days between May and July, it never gets dark in Fairbanks. Every night, the sun dips low in the sky. Just when it seems like it’s going to disappear beyond the horizon, it climbs back up. Why does this happen?
It has to do with the angle of our planet. Every 24 hours, Earth rotates on its axis. The side that faces the sun experiences daylight. For the side that’s facing away from the sun, it’s night. But Earth is not perfectly straight—it’s tilted. And during the summer months, the top of Earth is tilted toward the sun. So for areas above or near the Arctic Circle, the sun is pointed at them all day long.
Of course, it’s not all sunshine. In the winter months, the top of Earth is tilted away from the sun. That means in places with the midnight sun, daytime is very short in the winter. In some spots, the sun doesn’t come up for months.