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I just calculated the moment of the inertia of the earth using some data. I got the coefficient as 0.331, not 0.4 as for a solid sphere. What do you guys think it means ?

I reason the different of the 2 coefficient is because more mass of the earth concentrates toward its center. But I don't understand how that contribute to the difference in moment of inertia. How would you guy explain this ?

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# Moment of inertia of the earth

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