World Air Traffic Viewed From Space

Notice the change in traffic during night...then day.

This is a 24 hour observation of all of the large aircraft flights in the world, condensed down to about 2 minutes. From space we look like a bee hive of activity.

You could tell it was summer time in the north by the sun's footprint over the planet... You could see that it didn't quite set in the extreme north and it didn't quite rise in the extreme south. The move of air traffic from the US to Europe and back to the US in the 24 hour period is something to focus on.