the distance of the earth from the sun changes constantly during its revolution
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Answer:
The sun, being the center of the solar system, all the planets, their moons, asteroids, etc. are in orbit around it. The distance from Earth to the sun is called an astronomical unit, or AU. The AU has been defined as 149,597,870,700 meters.
However, the AU is only the average distance from the Earth to the sun. As you are aware, Earth makes a complete revolution around the sun every 365.25 days. But the orbit is not a perfect circle; it is slightly elliptical. Over the course of an orbit, Earth moves sometimes closer to the sun and sometimes farther away from the sun. Earth's closest approach to the sun, called perihelion, occurs in early January and is about 146 million km. The farthest from the sun Earth called aphelion, occurs in early July and is about 152 million km. As you can see, the difference is 6 million kilometres.
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Answer:
because the axis of the earth around the sun is not completely round
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