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Why do we have night and day?
Since the Earth rotates all of the time, we have night and day. The sun is the source of light for day, so that any time half of the Earth faces the sun, this part has day. The other half of the Earth faces away from the Sun and receives no light so it is dark and has night.
In midsummer in the Artic it is always daylight and Northern Europe and North America have long summer days. In Antartica at this time, it is always night. However, in midwinter it is the other way around. Antartica has permanent daylight, while the Artic is dark.
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