| 1. | The centre of gravity is displaced by a weight below the rotational axis .
调节旋转轴之下的一个重物，使重心发生位移。 |
| 2. | One of the most interesting facts about uranus is that its rotational axis is
天王星最有趣的地方是它的 |
| 3. | For the earth , the rotational axis tilts 23 . 5 . as a result , there is no seasonal change in venus
地球的自转轴倾角为23 . 5 ，所以金星并没有四季之分。 |
| 4. | Like a spinning top , the rotational axis of the earth is not fixed in space . it will move in a circle with a period about 26000 years . we call this the
像转动中的陀螺一样，地球的自转轴在太空中其实并不固定，而是以26000年的周期在转动，这个运动称为 |
| 5. | Since the rotational axis of the earth is tilted from the revolution axis by 23 . 5 , the sun , for example , rises at different directions at different times during the year
由于地球的自转轴相对于公转轨道平面倾斜了23 . 5度，再加上地球的绕日运动，所以太阳东升的方位角会随日子改变。 |
| 6. | Besides , by reason of its long distance from jupiter , the earth can maintain a rather circular orbit . also the gravitation of the moon can stabilize the tilt of the rotational axis of the earth , thus restricting climatic fluctuation within a narrow range
另外，地球因与木星保持距离，能维持著一个几近圆形的轨道，加上月球的引力稳定了地球自转轴倾斜的角度 |
| 7. | When electrons move in spirals around magnetic lines of force , radio waves are produced and radiated out along the two magnetic poles of the star . usually , the rotational axis of the neutron star does not align with the magnetic axis . the radiation beams will sweep around and create the
通常恒星的自转轴和磁轴并不一致，中子星亦不例外，所以沿著磁轴向外发射的无线电波束，在中子星自转的带动下，便会如灯塔般向宇宙扫射，这便是著名的 |
| 8. | We had observed more than ten selected asteroids using 1 - meter telescope in yunnan observatory during 2000 to 2002 . the observational data of seven asteroids had been reduced and analyzed . we have derived their synodic periods and estimated the shape and orientation of rotational axis for one asteroid
为此，我选定了一些直径在125公里左右的小行星进行观测和分析；一方面，测定它们的自转周期，进行“角动量衰减”现象的研究，另一方面，对小行星形状和自转轴指向进行估算，为小行星碰撞演化研究提供更为有利的证据。 |
