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The Concept Map you are trying to access has information related to:
seasons plus links, sun, 23.5 degree tilt of axis, added concepts and links, pollution, aphelion, winter, winter, spring, length of day, negligible effect, position in orbit, temperature variations, height of sun above horizon, clouds, amount of sunlight, fall, summer, seasons, north star, 147.5 million km, 24 hr. day, summer, perihelion, 152.6 milliom km, 24 hr. darkness