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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.
There are a few reasons why seasonal dates can vary from year to year. 1  A year is not an even number of days and neither are the seasons. 2  Another reason is that the Earth's elliptical orbit is changing its orientation relative to the Sun (it skews), which causes the Earth's axis to constantly point in a different direction, called precession.