The Earth's rotation and revolution Movement was originally astrometry and ground studies of common research topics, but the methods and goals of different.
地球的自转运动和公转运动本来就是天体测量学和地学共同的研究课题，但方法和目的有所不同。
2
Theoretical study shows that the ratio of revolution velocity to rotation velocity will affect the magnitude and direction of resistance moment of all the cutters.
理论分析表明：行星轮公转与自转的速比，影响着每个切削刀具的阻力矩的大小与方向；
3
Because of rotation and revolution of the earth, solar ultraviolet radiation intensity varies in diurnal and annual periodic.