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A season is a division of the year marked by changes in weather, ecology and hours of daylight. Seasons result from the yearly orbit of the Earth around the Sun and the tilt of the Earth's rotational axis relative to the plane of the orbit.
Why does the length of the day change as the seasons change? because the earth is tilted as it rotates the sun more or less of the surface is exposed in the hemisphere. So when it is winter in the northern hemisphere it is summer in theâ¦ southern hemisphere.