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远在1687年,牛顿已说到地球自转轴的运动,欧拉在1790年指出:由于地球转动的主要动力矩的方向,并不和地球惯性椭球的短轴方向相重合,将使地球的自转轴发生沿着一个圆锥面的摆动.假定地球为一个刚体时,可以从地球惯性椭球的扁率(或称力学椭率,或动力学扁率)算出地球自转轴运动的周期.从地球的岁差和章动可以算出地球
As far back as 1687, Newton had spoken of the Earth’s axis of rotation. Euler pointed out in 1790 that because the direction of the main moment of motion of the earth does not coincide with the short axis of the Earth’s ellipsoid of inertia, Rotation of a rotating shaft occurs along a conical surface. Assuming that the Earth is a rigid body, the period of motion of the Earth’s rotation axis can be calculated from the flattening (or mechanical ellipticity, or dynamical flattening) of the earth’s ellipsoidal inertia. Precession and nutation can calculate the earth