The term for the way that Earth wobbles around its rotation axis is called axial precession.
Why the Earth wobbles ?
- It is known as the shape if the earth is spherical but actual shape is oblate spheroid. The mass of the earth is contributed unevenly.
- The Earth's axis appears stable but it actually wobbles very slowly like a spinning top.
- Due to this reason the earth starts wobbles.
What is rotational axis?
The imaginary line through which the earth is rotated and repeat itself during complete rotation is called rotational axis of the earth.
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