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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.
Seasons occur because of the tilt of the Earth's rotational axis, which is about 23.4 degrees. Around the June Solstice, the Northern Hemisphere is tilted toward the Sun. This causes summer there. The Southern Hemisphere, on the other hand, is tilted away from the sun and therefore, experiences winter.