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The Earth and all the planets follow Kepler's three laws of planetary motion, which means the Earth travels in an ellipse which takes us around the Sun at a distance that varies from 147.1 to 152.1 million kilometres, when the Earth is at the opposite ends of the major axis of the ellipse.

The orbit is technically an ellipse but practically almost a perfect circle, with the Sun 2.5 million km off-centre.

As the distance changes, so does the speed, but the sum of the kinetic energy and the potential energy stays constant and the orbit remains very stable.

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10y ago

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