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.

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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.

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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.

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