The change of earth oblateness in its history
地球扁率在其历史上的变化

The change of the earth's shape is one of the basic problems in the study of earth evolution.The change of oblateness in individual geological periods is needed to determine the change of the earth's shape.The relationship among the oblateness,the radius,the quality and the angular velocity of the earth can be derived according to the oblateness formula of the earth.The oblateness in each time can be calculated according to the conjectured change of the radius,the quality and the angular velocity.The oblateness tends to decrease since the formation of the earth.The earth is a ellipsoid consisted of both solid and liquid,so the true value in each geological time should be less than the calcdated oblateness.