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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.
One of the most common causes for a temperature set point change is an acute infection with a virus or bacteria. Part of the immune response is to invoke a fever, which is actually a resetting of the core body temperature to a higher value.