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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 explained. The cycle of seasons is caused by Earth's tilt on its axis and the planet's orbit around the sun. When the axis points toward the sun, that hemisphere experiences summer. The hemisphere tilted away from the sun experiences winter.