ANDRZEJ WOJCICKI / SCIENCE PHOTO LIBRARY ANDRZEJ WOJCICKI / SCIENCE PHOTO LIBRARY
Animation of planet Earth rotating, showing the dividing line between the day and night sides. This line is called the terminator, and its passage is experienced on the surface as evening twilight. The angle of the terminator depends on the season. This animation shows the situation in the northern hemisphere summer, where the north pole (top) is in constant daylight.
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