Tue October 02, 2012 By: Zubair Ramzan

hi m,y question is we take radious of earth equal to 6400km but the radous of earth is differnt at poles and at equator then which radious we take???

Expert Reply
Wed October 03, 2012
Earth is not perfectly spherical, so no single value serves as its natural radius. Distances from points on the surface to the center range from 6,353 km to 6,384 km. Several different ways of modeling the Earth as a sphere each yield a mean radius of 6,371 km, which can be further approximated to 6400 km.
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