中天观测

中国古代太阳中天观测及二至点测算精度

The Accuracy of the Sun 's Meridian Observation and the Solstices Survey and Calculation in Ancient China

在上、下中天观测，地球自转角速度的变化对脉冲星的周期变率的影响较大。

While observing at upper or lower culmination the effect on the rate of change of the pulsar period becomes larger .

其次考察了冕洞存在时，146MHz扇束干涉仪的中天观测特征。

The records of 146 MHz fan beam interferometer at the Miyun station of the Beijing Observatory during the presence of coronal holes are examined .

本文根据矿山走向测量的精度要求，和陀螺定向逆转点法、中天法观测及数据处理模型的近似条件，分析讨论了对观测值变动范围的限制性要求。

Based on the requirements for the accuracy of mine gyroscopic orientation survey and the similar conditions data-processing models by the method of inversion points and transit method , this paper analyses and discusses the limited requirement to the changing range of observed value .