Question

why does the speed of Earth's Revolution vary​

Answer 1

Distance of the earth from sun varies as it revolves in an elliptical orbit. As the distance changes gravitational pull of the sun on the earth also changes . That's why the speed of earth's revolution varies.

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Answer 2

Answer:

The speed of Earth's Revolution varies due to its elliptical orbit.

Explanation:

In the solar system all the ‘planets’ revolve around the ‘sun’ in their respective orbits. The earth revolves around the sun in its elliptical orbit. If the Earth were to circle the sun around, the Earth's speed around the sun would be steady.  

We can think about this as the Earth's normal speed. But due to ‘curved shape’ of the Earth’s orbit the speed of the Earth fluctuates consistently. The speed of the Earth is quickest when it is ‘nearest to the sun’ in January, and slowest when it is most remote ‘far from the sun’ in July. As it were, in January it will move quicker than normal, and in July it will move slower than normal.