Seasons are a product of two things; the skewing of Earth’s axis, and the eccentricity of Earth’s orbit. The Earth’s rotational axis is at a tilt of 23.5 degrees from the axis of revolutions about the sun, which causes the length of days and nights to vary. The eccentricity of Earth’s orbit is what causes temperature variations. Summer is defined as beginning on the longest day of the year. Winter starts on the shortest day of the year. Fall and spring mark the points at which the lengths of day and night become equal. To answer your question, it does work out that all four seasons contain close to the same amount of days. The seasonal year is offset from the calendar year by a quarter of a day each year, which accounts for leap years. It varies slightly over the years due to gravitational influence from other celestial bodies.
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