本程序实现了大地测量学的几个基本计算功能，包括大地主题正反算，高斯投影解算，和斜距改化功能-This program implements a few basic computing functions of Geodesy, including the earth and inverse operator, Gauss projection solver, and slope distance change function

使用龙格库塔法求解微分方程，建立火箭模型，大气密度用函数计算，对比两种改进型的高度，速度及距离随时间的变化规律。-Using the Runge-Kutta method to solve differential equations, build model rockets, air density is calculated using the function, comparison of the two modified height, speed and distance variat