岁差

In the modal of computing elevation angle and azimuth angle of satellite,we ignore the impact of precession,nutation and pole shift in the process of coordinate system transformation due to their small effects.

在卫星俯仰角和方位角的计算模型中，针对岁差、章动和极移的影响相对于卫星位置是二阶小量，因此在坐标系转换过程中忽略岁差、章动和极移的影响。

The specific research contents include: celestial coordinates The establishment of the Department; Sunday apparent motion of celestial bodies and the anniversary of the apparent motion; celestial parallax, atmospheric refraction, optical aberration, precession, nutation theory and applications; astronomical time measurement principles and time systems; depending on the location of celestial bodies return calculation methods.

具体的研究内容有：天球坐标系的建立；天体的周日视运动和周年视运动；天体的视差、大气折射、光行差、岁差、章动的理论及应用；天文时间计量的原则和时间系统的建立；天体视位置的归算方法等。

By means of the celestial globe which has been corrected in annual differential, for Zheng He's Star Drawing Pictures have been restored, on the basis of which each star in the Star Drawing Pictures corresponds to is contemporary name.

借助于经过岁差修正的星球仪复原了四幅郑和牵星图，并在此基础上考证出牵星图中每颗星所对应的现代星名。

Milankovitch orbit cycle consists of eccentricity, inclination and procession of equinoxes, which lead to palaeoclimatical cyclic transformation and form high frequency sequence, parasequence and beds with cyclic time of ten, four and two thousand years respectively.

米兰柯维奇天文旋回包括偏心率旋回、倾斜率旋回和岁差旋回，这几个轨道参数所驱动的古气候变迁，分别形成了周期为10万年(或40万年)、4万年及2万年的高频层序，即小层序组、小层序及小层单元。

Over the course of 26,000 years, the precession of the equinoxes makes one full circuit around the ecliptic.

在26000年中，该分点岁差使黄道附近的一个完整的电路。

He spent 10 years in observing the gnomon of 8 "chi" and obtained a precession of the equinoxes of only one degree every 45 years and 11 months.

他花10年的观察8教程"智"，并获得了岁差的分点只有一个度每45年零11个月。

So when the gyrocar tilts sideways, the precession torque generated tilts the gyroscope in a fore-and-aft direction- not much use.

因此，当gyrocar倾斜，侧身，岁差转矩产生的倾斜，陀螺在一个前列和尾部的方向没有太大的使用。

As the Earth's rotation axis in space there is precession and nutation, by the effects of precession and nutation is called true sidereal day sidereal day, excluding the impact of nutation, only affected by the precession of the sidereal day sidereal day is called flat.

由于地球自转轴在空间存在岁差和章动，受岁差和章动影响的恒星日称为真恒星日，扣除章动的影响，仅受岁差影响的恒星日称为平恒星日。

A slow westward shift of the equinoxes along the plane of the ecliptic , resulting from precession of Earth s axis of rotation , and causing the equinoxes to occur earlier each sidereal year .

分点岁差：指二分点沿着黄道平面向西的缓慢移动，它由地球中轴旋转的岁差而造成，并能导致二分点每个恒星年都提早出现。

In particular, precession of the equinoxes is the change in the orientation of Earth's axis which resembles a wobbling top, a complete cycle of which takes approximately 25,800 years.

其中 &分点岁差&是指地球的自转轴所发生的岁差现象(地球进行一个完整的岁差圈需要约 25，800 年的时间)。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。