what provides the tangential acceleration in earth's rotation around the sun?
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On average it is 0 and it is exactly so at aphelion and perihelion, but at any other time you have to take the vector dot product of the direction of motion and the acceleration in the direction of the Sun. The earth orbits around the sun because it has angular momentum.
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If you are worried about the slight ellipticity of the Earth’s orbit, it gets substantially more complicated. On average it is 0 and it is exactly so at aphelion and perihelion, but at any other time you have to take the vector dot product of the direction of motion and the acceleration in the direction of the Sun.
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