Day and night occur because the Earth is a sphere spinning on its axis. When a portion of the Earth spins to face the Sun, it is daytime. When the same area rotates away from the Sun, it is nighttime. The cycle of light and dark is continuous except near the North and South Pole. During the Northern Hemisphere summer, the North Pole always faces the Sun, so daytime is continuous for several weeks. At the same time, the South Pole faces away from the Sun (Southern Hemisphere winter) and is in continuous night.
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