python_通过广播星历自动计算某卫星一天内各时刻的位置

通过广播星历自动计算某卫星一天内各时刻的位置，并和同目录精密星历比对精度。注释很多。(The position of each time in a day is calculated automatically by broadcast ephemeris, and the accuracy is compared with that of precise ephemeris in the same catalog. There are many comments.)