Summer in the Arctic Circle means 24-hour daylight. The sun doesn't set; it just bounces along the horizon! This time-lapse video covers a week of Arctic summertime. Music by Avi Hochberg. -via baszkocsgenyfas
Great video. I leave it to the mathematicians to describe the apparent motion of the sun (and why it's not straight up/down). Also, it would make a neat video if the camera exactly tracked the sun (vertical and horizontal), so the horizon looked like it was bobbing up and down instead of the sun.
http://twenty-four-hours-of-sunlight.ytmnd.com/