低纬子午环的星径曲率改正研究

ON THE CURVATURE CORRECTION OF LLMC

在文献[1]，[2]中，我们已经推得云南天文台低纬子午环观测的星径曲率改正公式。本文以定性方法论述和分析了星径曲率改正。与以前的有关文章相比，我们对星径曲率改正的部分计算作了校正．为便于进行定性分析，本文给出了对应于云南天文台地理位置的星径曲率计算公式的特性曲线图。最后，我们认为：文中给出的星径曲率改正公式对观测天顶距大于25°的天体是比较有效的。在编制低纬子午环观测纲要时应当充分考虑这一点。

Based on a series of derived formulas for curvature correction, we have reviewed the curvature corrections of low latitude meridian circle (LLMC) of Yunnan Astronomical Observatory in this paper. Some revisions have been made for the calculation of various curvature corrections. In order to demonstrate the results for qualitative analyses, several figures were presented from different aspects of curvature corrections. The results have shown that our formulas are valid for zenith distance observation above 25° in position determination of stars.