The yellow dots are airplanes in the sky during a 24-hour period.
You will see the light of the day moving from the east to the west, as the Earth spins on its axis.
Also you will see the aircraft flow of traffic leaving the North American continent and travelling at night to arrive in the UK in the morning. Then you will see the flow changing, leaving the UK in the morning and flying to the American continent in daylight.
It is a 24-hour observation of all of the large aircraft flights in the world, condensed down to less than 2 minutes. From space we look like a beehive 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.
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