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The equinoxes are considered to mark the beginnings of the spring and autumn astronomical seasons. The astronomical seasons are heavily promoted by the mass media, but are no more "official" than any other method of reckoning seasonal change. The World meteorological Organization designates March 1 and September 1 respectively as the first days of spring and autumn. The ecological spring begins locally with the start of the growing season which can be as early as February and as late as May in temperate climates depending on latitude and topography. The ecological autumn begins locally when the leaves on deciduous trees change colour and start falling to the ground.

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