Thursday 13 February 2020

newtonian gravity - How do we know that Earth is not perfect sphere?


I've just read here that:




Equatorial radius = 6378.16 kilometers. Polar radius = 6356.78 kilometers, so the difference in circumference is 71.1 kilometers. It is not a perfect sphere, but kind of pear-shaped.



How correct is that information and what exactly are Equatorial radius and Polar radius with diagram if possible?




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