Neville插值CUMT

代码说明：

说明：  输入一天内的小时和分钟以及阶数，自动读取精密星历文件，Neville插值在所给阶数数据中间精度最高，所以会自动选择精度最高的情况插值。替换目录下sp3文件即可完成修改。(Input the hour, minute and order of a day, and automatically read the precise ephemeris file. Neville interpolation has the highest accuracy among the given order data, so it will automatically select the case with the highest accuracy. Replace the SP3 file in the directory to complete the modification.)

文件列表：

brdc0010.20n, 268168 , 2020-03-05
__MACOSX\._brdc0010.20n, 348 , 2020-03-05
igs20863.sp3, 253150 , 2020-03-05
__MACOSX\._igs20863.sp3, 368 , 2020-03-05
Neville CUMT测绘工程.py, 9468 , 2020-03-29
__MACOSX\._Neville CUMT测绘工程.py, 176 , 2020-03-29