地球的较差转动及其天文动力学效应

文中首先探讨了地球存在较差转动的可能性，证明了即使对于地球这样小的行星，其内部仍然可能存在较差转动。然后对地球较差转动规律及可能引起的三种地球动力学效应进行了分析；这三种地球动力学效应是：地球自转速率的近十年变化，黄赤交角的非摄动长期变化以及液核和固核所引起的近周日自由摆动及其对章动的影响。对这三种地球动力学效应的研究将有助于另一角度了解地球内部的结构及其运动形态。

THE EARTH'S DIFFERENTIAL ROTATION AND IT'S ASTROGEODYNAMICAL EFFECTS

In this paper, we discussed the possibility of the earth's differential rotation. Then we proved the differential rotation would possibly exist even for a small planet as earth. Then we discussed the possible three kinds of astrogeodynamical effects caused by differential rotation, they include: The earth's rotation on decadal time scales; the long term variation of the obliquity, the near diurnal free wobble due to the liquid core and inner core and it's effect to the nutation. It's favorable to find out the earth's internal structure and the earth's movement from the study of these effects.