Newton for years had been curious about the cause of the orbital motion of the moon and planets.
多年来，牛顿一直对月球和行星绕轨道运行的原因感到好奇。
Orbital motion about a point, especially as distinguished from axial rotation.
旋转，绕转：围绕一个点的轨道运动，尤指区别于绕轴旋转的。
For years Newton had been curious about the cause of the orbital motion of the moon and planets.
多年来，牛顿一直对月球和行星轨道运动的成因好奇。
But Newton for years had been curious about the cause of the orbital motion of the moon and planets.
但多年来牛顿一直对月球和行星绕轨道运行的起因好奇不已。
The equation of satellite orbital motion was derived in the conventional terrestrial coordinate system.
推导了协议地球坐标系下的卫星运动方程。
Spin-orbit coupling is the interaction between the spin magnetic moment of an electron and magnetic field generated by its orbital motion.
自旋-轨道耦合是电子的自旋磁矩和由轨道运动产生的磁场之间的相互作用。
Cometary accurate orbital motion is a complex and difficult problem. Its remarkable characteristic is the presence of the non-gravitational effect.
彗星的准确轨道运动的确定是个复杂而困难的问题，其显著特点是存在非引力效应。
In our work, the effect of Coulumb interaction between electrons, the effect of quantization of orbital motion, and the influence of alternating electric field have been taken into account.
在我们的结果中，特别考虑了电子间库仑作用的集体效应、磁场引起的电子轨道运动量子化效应及交变电场的影响。
This paper reveals the dynamical characteristics of relative orbital motion of formation flight and presents the principles and method for the orbit configuration design of formation flight.
本文研究了编队飞行卫星群的轨道动力学特性，提出了编队飞行的轨道构形设计的原则和方法。
A concept of natural formation and a general RT design method are proposed based on the relative Orbital Element method and the relative motion equation in this paper. An example is given.
基于相对轨道根数法，根据卫星相对运动方程，提出了“自然队形”的概念及队形设计的一般方法，并给出了具体的例子。
Then the paper applies EA and SPEA to an orbital transformation problem. - time-energy optimization o The paper also solve low thrust control problem of relative motion using fuzzy logic.
然后分别用一般的进化算法和改进的SPEA方法解决轨道转移的时间-能量优化问题，对于相对运动方程有限推力控制问题，本文用模糊控制的方法加以解决。
The dynamics of the relative motion between two nearby spacecraft is investigated in a local orbital coordinate system. It' has been pointed out that an equilibrium state may exist in the motion;
采用本地轨道坐标系对两邻近飞船间相对运动动力学展开研究，指出在相对运动中也存在平衡状态；
Radius and orbital velocities can be directly expressed as functions of time or polar angle, which is helpful for designing flight mission and motion trajectory.
这种方法可直接获得向径、轨道速度等参数随时间或极角（绕地心的转动角）的变化，便于分析轨道转移与逃逸运动，有助于飞行使命与运动轨迹的设计。
All classic orbital elements and usual angular motion parameters can be calculated with the new set of generalized coordinates and their rates.
经典的质心轨道根数，以及系绳在质心轨道面内与轨道面外的摆动角，均可由上述六个广义坐标及其广义速度确定。
All classic orbital elements and usual angular motion parameters can be calculated with the new set of generalized coordinates and their rates.
经典的质心轨道根数，以及系绳在质心轨道面内与轨道面外的摆动角，均可由上述六个广义坐标及其广义速度确定。
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