Flattening of the earth's polar regions and bulging of its equatorial region are usually attributed to the ‘centrifugal force’ due to the earth's spin motion. ‘Centrifugal force’ is fictitious, yet it is assumed to physically affect earth’s shape. Earth’s spin motion is apparent only with respect to its own north-south central (spin) axis. With respect to absolute space, every point on earth continuously moves in the same (mean) direction as the direction of the sun's linear motion, at slightly different linear speeds. Very small centrifugal action (due to the differences in linear speeds of its constituent 3D matter particles) on earth is not sufficient to produce the observed magnitudes of equatorial bulge and flattening of its polar regions. This article intends to describe an alternative mechanism that causes observed physical deformation of the earth.