地球自转运动包括岁差和章动，极移和日长的变化。
The rotation of the Earth includes precession, nutation, variations of the rotation rate and polar motion.
采用特殊设计的传动机构结合PLC控制物体作直线往复运动和在预定位置作自转运动。
Special designed drive outfit and PLC are adopted to control object moving to-and-fro and rotating at prearranged positions.
早型O，B型星有扩散运动和自转运动，而晚型发射线星则没有明显的扩散或收缩的整体运动。
The expansion and rotation of the early O, B type stars have been found, but the similar motions are not discernible for the late-type stars.
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。
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。
The Earth's rotation and revolution Movement was originally astrometry and ground studies of common research topics, but the methods and goals of different.
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