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Earth's orbit around the sun
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Earth is sperical in shape and a circle does not have sides but earth does, why? - Quora
Elliptical Orbits
Strange but True: Earth Is Not Round | Scientific American
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Why is the earth in elliptical shape?
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What is the actual shape of the Earth, round, sphere or elliptical? Explain. - Quora
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Why Are Planetary Orbits Elliptical?
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