Hundreds of pictures of Earth, each taken at about 06:00 local time, show the terminator - the day/night line - over the course of one year. The Earth is tilted with respect to its orbit, the so the angle of the sunrise line tilts first one way and then the other over time.

You can see Africa and Saudi Arabia to the upper right, and clouds frantically changing each day.

The images were taken with the METEOSAT-9 Earth-observing satellite.


Credit: NASA Earth Observatory