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The length of the night in summer and winter is determined by the tilt of the Earth's axis and its orbit around the sun.
In the summer months, the Earth's axis is tilted towards the sun, so the Northern Hemisphere receives more direct sunlight and experiences longer periods of daylight. As a result, the nights are shorter.
In contrast, during the winter months, the Earth's axis is tilted away from the sun, so the Northern Hemisphere receives less direct sunlight and experiences shorter periods of daylight. This means that the nights are longer.
It is worth noting that the opposite is true for the Southern Hemisphere, where the summer and winter seasons are reversed.
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