[youtube]http://www.youtube.com/watch?v=yx7_yzypm5w[/youtube]
This one is quite neat. Here’s a YouTube clip showing all of the air traffic in the world in a single day, condensed to a little over a minute:
The yellow dots are airplanes in the sky during a 24 hour period. Stay with the picture. You will see the light of the day moving from the east to the west, as the Earth spins on its axis…
