Earth changing tangental velocity?

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    Earth Velocity
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SUMMARY

The Earth experiences changes in kinetic and potential energy as it orbits the Sun in an elliptical path. As the distance from the Sun varies, the Earth gains or loses potential energy, which directly affects its kinetic energy, resulting in constant acceleration along its orbit. However, any variations in gravitational force experienced on Earth due to these changes are negligible compared to local geographical changes, such as elevation differences.

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TuviaDaCat
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the Earth's spin is formed as an ellipse around the sun. so, i was wondering, it is obvious that the Earth is changing its distance from the sun along the ellipse, so that means that it loses or gains potential energy along the ellipse as well, therefor, could it be said that the Earth gains or loses kinetic energy along the way? because if it is, the Earth is constantly accelerating up and down around the sun.
also, assuming the Earth accelerates tangentanly, it means that in Earth reference there should be a different gravitation in different points on earth!

so is it true that the Earth changes its velocity?
 
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Yes! You have it exactly right: as it orbits, it essentially trades kinetic and potential energy back and forth. Any effect on Earth's gravity, though, will be negligible - you'll get a bigger change by driving to the nearest mountain.
 

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