Autumn, also known as fall in North American English, is one of the four temperate seasons.Outside the tropics, autumn marks the transition from summer to winter, in September (Northern Hemisphere) or March (Southern Hemisphere), when the duration of daylight becomes noticeably shorter and the temperature cools considerably. Day length decreases and night length increases as the season ...A season is a division of the year based on changes in weather, ecology, and the number of daylight hours in a given region. In popular culture, seasons are often divided by calendar date irrespective of weather and other deciding factors. On Earth, seasons are the result of Earths orbit around the Sun and Earths axial tilt relative to the ecliptic plane.
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