Why Are Summer Days Long and Winter Days Short?

By Staff WriterLast Updated Apr 1, 2020 9:45:32 PM ET
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The Earth's tilt on its axis is what causes the change in the seasons and explains why summer days are longer than winter days. The Earth orbits in an ellipse around the Sun, and because of this, it draws closer to the Sun at some points than at others. It is the direction of the Earth's tilt in its axis that determines the length of days and nights.