非旋转原点的动力学意义

On the Dynamical Meaning of the Non-rotating Origin

地球自转的精确描述要求在天球和地球的赤道上各选择一个参考点。Guinot建议以“非旋转原点”作为这样的一个参考点。深入了解非旋转原点的力学本质将有助于在实践中正确应用这一概念,并在理论上开拓新的课题。本文对非旋转原点的动力学定义、非旋转原点在惯性空间的运动、以非旋转原点作为参考原点的天体位置的误差等与非旋转原点有关的动力学问题作简要的介绍和评述,并进而讨论天球参考系的改进对恒星角的影响。

The exact description of the Earth's rotation requires the choice of a reference point on the equator both in space and in the Earth. Guinot has proposed a 'non-rotating origin' (NRO) to serve as such a reference point. A more detailed knowledge of the NRO's dynamical substance will be useful to its application both in practice and in theoretical investigations. In this paper, some dynamical problems are presented, such as the dynamical definition of the NRO, its movement in inertial space, errors in the position of a celestial body with the NRO as reference point etc. Furthermore, some discussions about the improvement of the celestial reference system on sidereal angle are put forward.