查询词典 zenith

The difference between the observation atmospheric refraction and Pulkovo table is about 15 arc second at the zenith distance of 84 degree.

在天顶距84°时，与普尔科沃大气折射表的差值约为15。

But the result also shows that with the increase of the propagation distance and the zenith angle, the fluctuation index is different so the classical Rytov's method is not applicable.

但随着天顶角的增大，传播距离的增加，其结果有所不同，经典Rytov方法也将不再适用。

Analysis results on the one hand showed consistency between the classical Rytov's method and the modified one, but they also showed the little difference with the increase of the propagation distance and the zenith angle, which implied that the classical Rytov's method was not applicable.

但随着天顶角的增大，传播距离的增加，闪烁强度的表现结果有所不同，这时的经典Rytov方法也将不能适用。

The method does not depend on strict local parameters and precise instruments, while the observational principle is relatively simple. An experimental observation was carried out with a simple telescope with large field of view at Xinglong station of NAOC at the end of 2007. The atmospheric refraction from the zenith distance of 44.8 degree to 87.5 degree is gotten by the differential method, which proves the feasibility of the method tentatively.

该方法不依赖于严格的地方参数和复杂精密的观测仪器，并且观测原理相对简单。2007年底，利用一台简易的大视场望远镜在兴隆观测站进行了试验观测，根据较差方法实测得到真天顶距44.8°至87.5°的大气折射值，初步证明了大气折射较差测量方法的可行性。

According to the engineering practice, the theoretical basis and method that survey directly the horizontal distance and height difference by the total station system as fourth grade and below fourth grade control network are put forward instead of surveying slant distance and zenith distance.

摘要根据工程实践，提出了用全站仪直接测量平距、高差来代替测斜距、天顶距作四等及四等以下控制网测量的理论依据和方法，并以张河湾抽水蓄能电站施工控制网为例进行了比较计算。

Based on the extended Huygens-Fresnel principle and the quadratic approximation of phase structure function, we have derived the analyticl expression of the spatial degree of coherence for partially coherent flattened beams propagating through the slant turbulent atmosphere with the help of tensor integral, then analyzed the effects of different zenith angle, propagation distance, coherence of source and outer scale of turbulence on the spatial degree of coherence on the receiver.

基于广义惠更斯-菲涅耳原理和相位结构函数的平方近似，运用张量积分的方法导出了部分相干平顶光束通过斜程湍流大气传输后接收面光束空间相干度的解析表达式，分析了不同天顶角、传输距离、光源相干性以及湍流外尺度对接收面光束空间相干度的影响。

In the first experiment, the rotating angle of the quarter-wave plate is calculated using information about the phase difference, azimuth angle and zenith angle of the telescope.

建立了偏振耦合分光的实验装置，分别用方案2和方案3进行了动态相位补偿实验研究。

Data of latitude observation with the zenith telescope ZTL-180 are recalculated in a homogeneous system for the years 1970-1980. In this Paper the following results are given:(1) Correction of the declination and the proper motion for each pair at 1970.0

对1970—1980年间的纬度观测资料，统一使用IAU1964系统天文常数，按直角坐标法计算全部星对的视赤纬，用统一的公式进行了全部观测结果的归算处理。

He has reached the zenith of his career.

他已经达到了他事业的顶峰。

Some are at the zenith of their careers.

有些是在天顶的自己的事业。

I go to school at night.

我是上上学。

Clear Tip Nasal Aspirator: A soft time and gentle suction action makes removing excess mucus easy.

鼻吸明确提示：一个柔软的时间和温柔吸力行动使消除过剩的粘液容易。