论文部分内容阅读
In the last decades, the contrast changes on of the Northern and Southern Hemispheres shapes have been investigated using the space geodetic observations, e.g., the secular and annual variations of the volumes, lengths of the circles of latitude and mean radius of the Northern and Southern hemispheres on the basis of current space geodetic data.It has shown the clear secular trend of the center of Earths mass, whose mechanism was as a consequence of the secular northward drift of the Earths core relative to the mantle.